Merge mozilla-central to autoland. a=merge on a CLOSED TREE
authorRazvan Maries <rmaries@mozilla.com>
Fri, 11 Jan 2019 17:33:16 +0200
changeset 453485 69cb7d6acb86156d05e9032cfde384b731bd796b
parent 453484 0b0fc6359576cdd592c2fac73a065225908e3fd4 (current diff)
parent 453416 2a99e348fde3d1674296bb82c5f3881e696e8fb6 (diff)
child 453486 3b7589bf68d0033774d061fbd7b03c50984046d9
push id35357
push usernerli@mozilla.com
push dateFri, 11 Jan 2019 21:54:07 +0000
treeherdermozilla-central@0ce024c91511 [default view] [failures only]
perfherder[talos] [build metrics] [platform microbench] (compared to previous push)
reviewersmerge
milestone66.0a1
first release with
nightly linux32
nightly linux64
nightly mac
nightly win32
nightly win64
last release without
nightly linux32
nightly linux64
nightly mac
nightly win32
nightly win64
Merge mozilla-central to autoland. a=merge on a CLOSED TREE
docshell/base/nsDocShell.cpp
dom/webidl/moz.build
modules/libpref/init/all.js
--- a/browser/base/content/browser.js
+++ b/browser/base/content/browser.js
@@ -1058,28 +1058,32 @@ function _loadURI(browser, uri, params =
     // to be a preloaded browser, clear the preloaded state now.
     browser.removeAttribute("preloadedState");
   }
 
   // !requiredRemoteType means we're loading in the parent/this process.
   if (!requiredRemoteType) {
     browser.inLoadURI = true;
   }
+  let loadURIOptions = {
+    triggeringPrincipal,
+    loadFlags: flags,
+    referrerURI,
+    referrerPolicy,
+    postData,
+  };
   try {
     if (!mustChangeProcess) {
       if (userContextId) {
         browser.webNavigation.setOriginAttributesBeforeLoading({
           userContextId,
           privateBrowsingId: PrivateBrowsingUtils.isBrowserPrivate(browser) ? 1 : 0,
         });
       }
-
-      browser.webNavigation.loadURIWithOptions(uri, flags,
-                                               referrerURI, referrerPolicy,
-                                               postData, null, null, triggeringPrincipal);
+      browser.webNavigation.loadURI(uri, loadURIOptions);
     } else {
       // Check if the current browser is allowed to unload.
       let {permitUnload, timedOut} = browser.permitUnload();
       if (!timedOut && !permitUnload) {
         return;
       }
 
       if (postData) {
@@ -1116,19 +1120,17 @@ function _loadURI(browser, uri, params =
       gBrowser.updateBrowserRemotenessByURL(browser, uri);
 
       if (userContextId) {
         browser.webNavigation.setOriginAttributesBeforeLoading({
           userContextId,
           privateBrowsingId: PrivateBrowsingUtils.isBrowserPrivate(browser) ? 1 : 0,
         });
       }
-
-      browser.webNavigation.loadURIWithOptions(uri, flags, referrerURI, referrerPolicy,
-                                               postData, null, null, triggeringPrincipal);
+      browser.webNavigation.loadURI(uri, loadURIOptions);
     } else {
       throw e;
     }
   } finally {
     if (!requiredRemoteType) {
       browser.inLoadURI = false;
     }
   }
--- a/browser/base/content/test/general/browser_e10s_switchbrowser.js
+++ b/browser/base/content/test/general/browser_e10s_switchbrowser.js
@@ -58,19 +58,20 @@ function clear_history() {
   gExpectedHistory.index = -1;
   gExpectedHistory.entries = [];
 }
 
 // Waits for a load and updates the known history
 var waitForLoad = async function(uri) {
   info("Loading " + uri);
   // Longwinded but this ensures we don't just shortcut to LoadInNewProcess
-  gBrowser.selectedBrowser.webNavigation.loadURI(uri, Ci.nsIWebNavigation.LOAD_FLAGS_NONE,
-                                                 null, null, null,
-                                                 Services.scriptSecurityManager.getSystemPrincipal());
+  let loadURIOptions = {
+    triggeringPrincipal: Services.scriptSecurityManager.getSystemPrincipal(),
+  };
+  gBrowser.selectedBrowser.webNavigation.loadURI(uri, loadURIOptions);
 
   await BrowserTestUtils.browserStopped(gBrowser);
   gExpectedHistory.index++;
   gExpectedHistory.entries.push({
     uri: gBrowser.currentURI.spec,
     title: gBrowser.contentTitle,
   });
 };
--- a/browser/base/content/test/plugins/browser.ini
+++ b/browser/base/content/test/plugins/browser.ini
@@ -51,17 +51,17 @@ tags = blocklist
 [browser_bug818118.js]
 [browser_bug820497.js]
 [browser_clearplugindata.js]
 tags = blocklist
 [browser_CTP_context_menu.js]
 skip-if = toolkit == "gtk3"   # fails intermittently on Linux (bug 909342)
 tags = blocklist
 [browser_CTP_crashreporting.js]
-skip-if = !crashreporter || verify
+skip-if = !crashreporter || verify || os == 'win' # bug 1442837
 tags = blocklist
 [browser_CTP_drag_drop.js]
 tags = blocklist
 [browser_CTP_favorfallback.js]
 [browser_CTP_hide_overlay.js]
 tags = blocklist
 [browser_CTP_iframe.js]
 tags = blocklist
--- a/browser/components/preferences/in-content/tests/browser.ini
+++ b/browser/components/preferences/in-content/tests/browser.ini
@@ -49,16 +49,17 @@ skip-if = (verify && debug && (os == 'li
 [browser_contentblocking.js]
 [browser_cookies_exceptions.js]
 [browser_defaultbrowser_alwayscheck.js]
 [browser_healthreport.js]
 skip-if = true || !healthreport # Bug 1185403 for the "true"
 [browser_homepages_filter_aboutpreferences.js]
 [browser_homepages_use_bookmark.js]
 [browser_extension_controlled.js]
+skipif = ccov && os == 'win' # bug 1437051
 [browser_languages_subdialog.js]
 [browser_browser_languages_subdialog.js]
 [browser_layersacceleration.js]
 [browser_masterpassword.js]
 [browser_newtab_menu.js]
 [browser_notifications_do_not_disturb.js]
 [browser_password_management.js]
 [browser_performance.js]
--- a/browser/components/sessionstore/ContentRestore.jsm
+++ b/browser/components/sessionstore/ContentRestore.jsm
@@ -199,46 +199,52 @@ ContentRestoreInternal.prototype = {
                        Utils.makeInputStream(loadArguments.postData) : null;
         let triggeringPrincipal = loadArguments.triggeringPrincipal
                                   ? Utils.deserializePrincipal(loadArguments.triggeringPrincipal)
                                   : Services.scriptSecurityManager.createNullPrincipal({});
 
         if (loadArguments.userContextId) {
           webNavigation.setOriginAttributesBeforeLoading({ userContextId: loadArguments.userContextId });
         }
-
-        webNavigation.loadURIWithOptions(loadArguments.uri, loadArguments.flags,
-                                         referrer, referrerPolicy, postData,
-                                         null, null, triggeringPrincipal);
+        let loadURIOptions = {
+          triggeringPrincipal,
+          loadFlags: loadArguments.flags,
+          referrerURI: referrer,
+          referrerPolicy,
+          postData,
+        };
+        webNavigation.loadURI(loadArguments.uri, loadURIOptions);
       } else if (tabData.userTypedValue && tabData.userTypedClear) {
         // If the user typed a URL into the URL bar and hit enter right before
         // we crashed, we want to start loading that page again. A non-zero
         // userTypedClear value means that the load had started.
         // Load userTypedValue and fix up the URL if it's partial/broken.
-        webNavigation.loadURI(tabData.userTypedValue,
-                              Ci.nsIWebNavigation.LOAD_FLAGS_ALLOW_THIRD_PARTY_FIXUP,
-                              null, null, null,
-                              Services.scriptSecurityManager.getSystemPrincipal());
+        let loadURIOptions = {
+          triggeringPrincipal: Services.scriptSecurityManager.getSystemPrincipal(),
+          loadFlags: Ci.nsIWebNavigation.LOAD_FLAGS_ALLOW_THIRD_PARTY_FIXUP,
+        };
+        webNavigation.loadURI(tabData.userTypedValue, loadURIOptions);
       } else if (tabData.entries.length) {
         // Stash away the data we need for restoreDocument.
         let activeIndex = tabData.index - 1;
         this._restoringDocument = {entry: tabData.entries[activeIndex] || {},
                                    formdata: tabData.formdata || {},
                                    scrollPositions: tabData.scroll || {}};
 
         // In order to work around certain issues in session history, we need to
         // force session history to update its internal index and call reload
         // instead of gotoIndex. See bug 597315.
         history.reloadCurrentEntry();
       } else {
         // If there's nothing to restore, we should still blank the page.
-        webNavigation.loadURI("about:blank",
-                              Ci.nsIWebNavigation.LOAD_FLAGS_BYPASS_HISTORY,
-                              null, null, null,
-                              Services.scriptSecurityManager.getSystemPrincipal());
+        let loadURIOptions = {
+          triggeringPrincipal: Services.scriptSecurityManager.getSystemPrincipal(),
+          loadFlags: Ci.nsIWebNavigation.LOAD_FLAGS_BYPASS_HISTORY,
+        };
+        webNavigation.loadURI("about:blank", loadURIOptions);
       }
 
       return true;
     } catch (ex) {
       if (ex instanceof Ci.nsIException) {
         // Ignore page load errors, but return false to signal that the load never
         // happened.
         return false;
@@ -372,19 +378,21 @@ HistoryListener.prototype = {
     // would use the current document and change the displayed URL only.
     this.webNavigation.setCurrentURI(Services.io.newURI("about:blank"));
 
     // Kick off a new load so that we navigate away from about:blank to the
     // new URL that was passed to loadURI(). The new load will cause a
     // STATE_START notification to be sent and the ProgressListener will then
     // notify the parent and do the rest.
     let flags = Ci.nsIWebNavigation.LOAD_FLAGS_ALLOW_THIRD_PARTY_FIXUP;
-    this.webNavigation.loadURI(newURI.spec, flags,
-                               null, null, null,
-                               Services.scriptSecurityManager.getSystemPrincipal());
+    let loadURIOptions = {
+      triggeringPrincipal: Services.scriptSecurityManager.getSystemPrincipal(),
+      loadFlags: flags,
+    };
+    this.webNavigation.loadURI(newURI.spec, loadURIOptions);
   },
 
   OnHistoryReload(reloadURI, reloadFlags) {
     this.callback();
 
     // Cancel the load.
     return false;
   },
--- a/browser/components/sessionstore/test/browser_async_remove_tab.js
+++ b/browser/components/sessionstore/test/browser_async_remove_tab.js
@@ -112,18 +112,17 @@ add_task(async function save_worthy_tabs
 
 add_task(async function save_worthy_tabs_remote_final() {
   let {tab, r} = await createTabWithRandomValue("about:blank");
   let browser = tab.linkedBrowser;
   ok(browser.isRemoteBrowser, "browser is remote");
 
   // Replace about:blank with a new remote page.
   let snippet = 'webNavigation.loadURI("https://example.com/",\
-                                       null, null, null, null,\
-                                       Services.scriptSecurityManager.getSystemPrincipal())';
+    {triggeringPrincipal: Services.scriptSecurityManager.getSystemPrincipal()})';
   await promiseNewLocationAndHistoryEntryReplaced(browser, snippet);
 
   // Remotness shouldn't have changed.
   ok(browser.isRemoteBrowser, "browser is still remote");
 
   // Remove the tab before the update arrives.
   let promise = promiseRemoveTabAndSessionState(tab);
 
--- a/browser/components/sessionstore/test/browser_docshell_uuid_consistency.js
+++ b/browser/components/sessionstore/test/browser_docshell_uuid_consistency.js
@@ -38,18 +38,20 @@ add_task(async function contentToChromeN
     is(sh.count, 1);
     is(sh.legacySHistory.getEntryAtIndex(0).docshellID.toString(), docshell.historyID.toString());
   });
 
   // Force the browser to navigate to the chrome process.
   await ContentTask.spawn(tab.linkedBrowser, null, function() {
     const CHROME_URL = "about:config";
     let webnav = content.window.getInterface(Ci.nsIWebNavigation);
-    let systemPrincipal = Services.scriptSecurityManager.getSystemPrincipal();
-    webnav.loadURI(CHROME_URL, Ci.nsIWebNavigation.LOAD_FLAGS_NONE, null, null, null, systemPrincipal);
+    let loadURIOptions = {
+      triggeringPrincipal: Services.scriptSecurityManager.getSystemPrincipal(),
+    };
+    webnav.loadURI(CHROME_URL, loadURIOptions);
   });
   await BrowserTestUtils.browserLoaded(tab.linkedBrowser);
 
   // Check to be sure that we're in the chrome process.
   let docShell = tab.linkedBrowser.frameLoader.docShell;
 
   // 'cause we're in the chrome process, we can just directly poke at the shistory.
   let sh = docShell.QueryInterface(Ci.nsIWebNavigation).sessionHistory;
--- a/browser/components/shell/HeadlessShell.jsm
+++ b/browser/components/shell/HeadlessShell.jsm
@@ -10,17 +10,20 @@ ChromeUtils.import("resource://gre/modul
 ChromeUtils.import("resource://gre/modules/osfile.jsm");
 
 // Refrences to the progress listeners to keep them from being gc'ed
 // before they are called.
 const progressListeners = new Map();
 
 function loadContentWindow(webNavigation, uri, principal) {
   return new Promise((resolve, reject) => {
-    webNavigation.loadURI(uri, Ci.nsIWebNavigation.LOAD_FLAGS_NONE, null, null, null, principal);
+    let loadURIOptions = {
+      triggeringPrincipal: principal,
+    };
+    webNavigation.loadURI(uri, loadURIOptions);
     let docShell = webNavigation.QueryInterface(Ci.nsIInterfaceRequestor)
                                 .getInterface(Ci.nsIDocShell);
     let webProgress = docShell.QueryInterface(Ci.nsIInterfaceRequestor)
                               .getInterface(Ci.nsIWebProgress);
     let progressListener = {
       onLocationChange(progress, request, location, flags) {
         // Ignore inner-frame events
         if (progress != webProgress) {
--- a/browser/extensions/webcompat-reporter/experimentalAPIs/tabExtras.js
+++ b/browser/extensions/webcompat-reporter/experimentalAPIs/tabExtras.js
@@ -125,19 +125,22 @@ this.tabExtras = class extends Extension
                     browser === tab.browser &&
                     locationURI.spec === url) {
                   windowTracker.removeListener("progress", listener);
                   resolve();
                 }
               },
             };
             windowTracker.addListener("progress", listener);
-            let triggeringPrincipal = Services.scriptSecurityManager.createNullPrincipal({});
-            tab.browser.webNavigation.loadURIWithOptions(url, null, null, null,
-                                                         post, null, null, triggeringPrincipal);
+
+            let loadURIOptions = {
+              triggeringPrincipal: Services.scriptSecurityManager.createNullPrincipal({}),
+              postData: post,
+            };
+            tab.browser.webNavigation.loadURI(url, loadURIOptions);
           });
         },
         async getWebcompatInfo(tabId) {
           return new Promise(resolve => {
             const messageName = "WebExtension:GetWebcompatInfo";
             const code = `${getInfoFrameScript.toString()};getInfoFrameScript("${messageName}")`;
             const mm = tabManager.get(tabId).browser.messageManager;
             mm.loadFrameScript(`data:,${encodeURI(code)}`, false);
--- a/config/config.mk
+++ b/config/config.mk
@@ -297,23 +297,32 @@ endif
 else
 # For setting subsystem version
 WIN32_EXE_LDFLAGS	+= $(WIN32_CONSOLE_EXE_LDFLAGS)
 endif
 endif # WINNT
 
 ifdef _MSC_VER
 ifeq ($(CPU_ARCH),x86_64)
-ifdef MOZ_ASAN
-# ASan could have 3x stack memory usage of normal builds.
-WIN32_EXE_LDFLAGS	+= -STACK:6291456
+# Normal operation on 64-bit Windows needs 2 MB of stack. (Bug 582910)
+# ASAN requires 6 MB of stack.
+# Setting the stack to 8 MB to match the capability of other systems
+# to deal with frame construction for unreasonably deep DOM trees
+# with worst-case styling. This uses address space unnecessarily for
+# non-main threads, but that should be tolerable on 64-bit systems.
+# (Bug 256180)
+WIN32_EXE_LDFLAGS      += -STACK:8388608
 else
-# set stack to 2MB on x64 build.  See bug 582910
-WIN32_EXE_LDFLAGS	+= -STACK:2097152
-endif
+# Since this setting affects the default stack size for non-main
+# threads, too, to avoid burning the address space, increase only
+# 512 KB over the default. Just enough to be able to deal with
+# reasonable styling applied to DOM trees whose depth is near what
+# Blink's HTML parser can output, esp.
+# layout/base/crashtests/507119.html (Bug 256180)
+WIN32_EXE_LDFLAGS      += -STACK:1572864
 endif
 endif
 
 -include $(topsrcdir)/$(MOZ_BUILD_APP)/app-config.mk
 
 ######################################################################
 
 GARBAGE		+= $(DEPENDENCIES) core $(wildcard core.[0-9]*) $(wildcard *.err) $(wildcard *.pure) $(wildcard *_pure_*.o) Templates.DB
--- a/docshell/base/nsDocShell.cpp
+++ b/docshell/base/nsDocShell.cpp
@@ -53,16 +53,17 @@
 #include "mozilla/dom/ScriptSettings.h"
 #include "mozilla/dom/ServiceWorkerInterceptController.h"
 #include "mozilla/dom/ServiceWorkerUtils.h"
 #include "mozilla/dom/SessionStorageManager.h"
 #include "mozilla/dom/TabChild.h"
 #include "mozilla/dom/TabGroup.h"
 #include "mozilla/dom/ToJSValue.h"
 #include "mozilla/dom/ChildSHistory.h"
+#include "mozilla/dom/LoadURIOptionsBinding.h"
 
 #include "mozilla/net/ReferrerPolicy.h"
 
 #include "nsIApplicationCacheChannel.h"
 #include "nsIApplicationCacheContainer.h"
 #include "nsIAppShell.h"
 #include "nsIAsyncVerifyRedirectCallback.h"
 #include "nsIAuthPrompt.h"
@@ -3798,155 +3799,141 @@ nsDocShell::GotoIndex(int32_t aIndex) {
   if (!IsNavigationAllowed()) {
     return NS_OK;  // JS may not handle returning of an error code
   }
   RefPtr<ChildSHistory> rootSH = GetRootSessionHistory();
   NS_ENSURE_TRUE(rootSH, NS_ERROR_FAILURE);
   return rootSH->LegacySHistory()->GotoIndex(aIndex);
 }
 
-NS_IMETHODIMP
-nsDocShell::LoadURI(const nsAString& aURI, uint32_t aLoadFlags,
-                    nsIURI* aReferringURI, nsIInputStream* aPostStream,
-                    nsIInputStream* aHeaderStream,
-                    nsIPrincipal* aTriggeringPrincipal) {
-  if (mUseStrictSecurityChecks && !aTriggeringPrincipal) {
-    return NS_ERROR_FAILURE;
-  }
-  return LoadURIWithOptions(aURI, aLoadFlags, aReferringURI, RP_Unset,
-                            aPostStream, aHeaderStream, nullptr,
-                            aTriggeringPrincipal);
-}
-
-NS_IMETHODIMP
-nsDocShell::LoadURIWithOptions(const nsAString& aURI, uint32_t aLoadFlags,
-                               nsIURI* aReferringURI, uint32_t aReferrerPolicy,
-                               nsIInputStream* aPostStream,
-                               nsIInputStream* aHeaderStream, nsIURI* aBaseURI,
-                               nsIPrincipal* aTriggeringPrincipal) {
-  NS_ASSERTION((aLoadFlags & INTERNAL_LOAD_FLAGS_LOADURI_SETUP_FLAGS) == 0,
+nsresult nsDocShell::LoadURI(const nsAString& aURI,
+                             const LoadURIOptions& aLoadURIOptions) {
+  uint32_t loadFlags = aLoadURIOptions.mLoadFlags;
+
+  NS_ASSERTION((loadFlags & INTERNAL_LOAD_FLAGS_LOADURI_SETUP_FLAGS) == 0,
                "Unexpected flags");
 
   if (!IsNavigationAllowed()) {
     return NS_OK;  // JS may not handle returning of an error code
   }
   nsCOMPtr<nsIURI> uri;
-  nsCOMPtr<nsIInputStream> postStream(aPostStream);
+  nsCOMPtr<nsIInputStream> postData(aLoadURIOptions.mPostData);
   nsresult rv = NS_OK;
 
   // Create a URI from our string; if that succeeds, we want to
-  // change aLoadFlags to not include the ALLOW_THIRD_PARTY_FIXUP
+  // change loadFlags to not include the ALLOW_THIRD_PARTY_FIXUP
   // flag.
 
   NS_ConvertUTF16toUTF8 uriString(aURI);
   // Cleanup the empty spaces that might be on each end.
   uriString.Trim(" ");
   // Eliminate embedded newlines, which single-line text fields now allow:
   uriString.StripCRLF();
   NS_ENSURE_TRUE(!uriString.IsEmpty(), NS_ERROR_FAILURE);
 
-  if (mUseStrictSecurityChecks && !aTriggeringPrincipal) {
+  if (mUseStrictSecurityChecks && !aLoadURIOptions.mTriggeringPrincipal) {
     return NS_ERROR_FAILURE;
   }
 
   rv = NS_NewURI(getter_AddRefs(uri), uriString);
   if (uri) {
-    aLoadFlags &= ~LOAD_FLAGS_ALLOW_THIRD_PARTY_FIXUP;
+    loadFlags &= ~LOAD_FLAGS_ALLOW_THIRD_PARTY_FIXUP;
   }
 
   nsCOMPtr<nsIURIFixupInfo> fixupInfo;
   if (sURIFixup) {
     // Call the fixup object.  This will clobber the rv from NS_NewURI
     // above, but that's fine with us.  Note that we need to do this even
     // if NS_NewURI returned a URI, because fixup handles nested URIs, etc
     // (things like view-source:mozilla.org for example).
     uint32_t fixupFlags = 0;
-    if (aLoadFlags & LOAD_FLAGS_ALLOW_THIRD_PARTY_FIXUP) {
+    if (loadFlags & LOAD_FLAGS_ALLOW_THIRD_PARTY_FIXUP) {
       fixupFlags |= nsIURIFixup::FIXUP_FLAG_ALLOW_KEYWORD_LOOKUP;
     }
-    if (aLoadFlags & LOAD_FLAGS_FIXUP_SCHEME_TYPOS) {
+    if (loadFlags & LOAD_FLAGS_FIXUP_SCHEME_TYPOS) {
       fixupFlags |= nsIURIFixup::FIXUP_FLAG_FIX_SCHEME_TYPOS;
     }
     nsCOMPtr<nsIInputStream> fixupStream;
     rv = sURIFixup->GetFixupURIInfo(uriString, fixupFlags,
                                     getter_AddRefs(fixupStream),
                                     getter_AddRefs(fixupInfo));
 
     if (NS_SUCCEEDED(rv)) {
       fixupInfo->GetPreferredURI(getter_AddRefs(uri));
       fixupInfo->SetConsumer(GetAsSupports(this));
     }
 
     if (fixupStream) {
       // GetFixupURIInfo only returns a post data stream if it succeeded
       // and changed the URI, in which case we should override the
       // passed-in post data.
-      postStream = fixupStream;
-    }
-
-    if (aLoadFlags & LOAD_FLAGS_ALLOW_THIRD_PARTY_FIXUP) {
+      postData = fixupStream;
+    }
+
+    if (loadFlags & LOAD_FLAGS_ALLOW_THIRD_PARTY_FIXUP) {
       nsCOMPtr<nsIObserverService> serv = services::GetObserverService();
       if (serv) {
         serv->NotifyObservers(fixupInfo, "keyword-uri-fixup",
                               PromiseFlatString(aURI).get());
       }
     }
   }
   // else no fixup service so just use the URI we created and see
   // what happens
 
   if (NS_ERROR_MALFORMED_URI == rv) {
     if (DisplayLoadError(rv, uri, PromiseFlatString(aURI).get(), nullptr) &&
-        (aLoadFlags & LOAD_FLAGS_ERROR_LOAD_CHANGES_RV) != 0) {
+        (loadFlags & LOAD_FLAGS_ERROR_LOAD_CHANGES_RV) != 0) {
       return NS_ERROR_LOAD_SHOWED_ERRORPAGE;
     }
   }
 
   if (NS_FAILED(rv) || !uri) {
     return NS_ERROR_FAILURE;
   }
 
   PopupBlocker::PopupControlState popupState;
-  if (aLoadFlags & LOAD_FLAGS_ALLOW_POPUPS) {
+  if (loadFlags & LOAD_FLAGS_ALLOW_POPUPS) {
     popupState = PopupBlocker::openAllowed;
-    aLoadFlags &= ~LOAD_FLAGS_ALLOW_POPUPS;
+    loadFlags &= ~LOAD_FLAGS_ALLOW_POPUPS;
   } else {
     popupState = PopupBlocker::openOverridden;
   }
   nsAutoPopupStatePusher statePusher(popupState);
 
-  bool forceAllowDataURI = aLoadFlags & LOAD_FLAGS_FORCE_ALLOW_DATA_URI;
+  bool forceAllowDataURI = loadFlags & LOAD_FLAGS_FORCE_ALLOW_DATA_URI;
 
   // Don't pass certain flags that aren't needed and end up confusing
   // ConvertLoadTypeToDocShellInfoLoadType.  We do need to ensure that they are
   // passed to LoadURI though, since it uses them.
-  uint32_t extraFlags = (aLoadFlags & EXTRA_LOAD_FLAGS);
-  aLoadFlags &= ~EXTRA_LOAD_FLAGS;
+  uint32_t extraFlags = (loadFlags & EXTRA_LOAD_FLAGS);
+  loadFlags &= ~EXTRA_LOAD_FLAGS;
 
   RefPtr<nsDocShellLoadState> loadState = new nsDocShellLoadState(uri);
 
   /*
    * If the user "Disables Protection on This Page", we have to make sure to
    * remember the users decision when opening links in child tabs [Bug 906190]
    */
-  if (aLoadFlags & LOAD_FLAGS_ALLOW_MIXED_CONTENT) {
+  if (loadFlags & LOAD_FLAGS_ALLOW_MIXED_CONTENT) {
     loadState->SetLoadType(
-        MAKE_LOAD_TYPE(LOAD_NORMAL_ALLOW_MIXED_CONTENT, aLoadFlags));
+        MAKE_LOAD_TYPE(LOAD_NORMAL_ALLOW_MIXED_CONTENT, loadFlags));
   } else {
-    loadState->SetLoadType(MAKE_LOAD_TYPE(LOAD_NORMAL, aLoadFlags));
+    loadState->SetLoadType(MAKE_LOAD_TYPE(LOAD_NORMAL, loadFlags));
   }
 
   loadState->SetLoadFlags(extraFlags);
   loadState->SetFirstParty(true);
-  loadState->SetPostDataStream(postStream);
-  loadState->SetReferrer(aReferringURI);
-  loadState->SetReferrerPolicy((mozilla::net::ReferrerPolicy)aReferrerPolicy);
-  loadState->SetHeadersStream(aHeaderStream);
-  loadState->SetBaseURI(aBaseURI);
-  loadState->SetTriggeringPrincipal(aTriggeringPrincipal);
+  loadState->SetPostDataStream(postData);
+  loadState->SetReferrer(aLoadURIOptions.mReferrerURI);
+  loadState->SetReferrerPolicy(
+      (mozilla::net::ReferrerPolicy)aLoadURIOptions.mReferrerPolicy);
+  loadState->SetHeadersStream(aLoadURIOptions.mHeaders);
+  loadState->SetBaseURI(aLoadURIOptions.mBaseURI);
+  loadState->SetTriggeringPrincipal(aLoadURIOptions.mTriggeringPrincipal);
   loadState->SetForceAllowDataURI(forceAllowDataURI);
 
   if (fixupInfo) {
     nsAutoString searchProvider, keyword;
     fixupInfo->GetKeywordProviderName(searchProvider);
     fixupInfo->GetKeywordAsSent(keyword);
     MaybeNotifyKeywordSearchLoading(searchProvider, keyword);
   }
@@ -3956,16 +3943,28 @@ nsDocShell::LoadURIWithOptions(const nsA
   // Save URI string in case it's needed later when
   // sending to search engine service in EndPageLoad()
   mOriginalUriString = uriString;
 
   return rv;
 }
 
 NS_IMETHODIMP
+nsDocShell::LoadURIFromScript(const nsAString& aURI,
+                              JS::Handle<JS::Value> aLoadURIOptions,
+                              JSContext* aCx) {
+  // generate dictionary for aLoadURIOptions and forward call
+  LoadURIOptions loadURIOptions;
+  if (!loadURIOptions.Init(aCx, aLoadURIOptions)) {
+    return NS_ERROR_INVALID_ARG;
+  }
+  return LoadURI(aURI, loadURIOptions);
+}
+
+NS_IMETHODIMP
 nsDocShell::DisplayLoadError(nsresult aError, nsIURI* aURI,
                              const char16_t* aURL, nsIChannel* aFailedChannel,
                              bool* aDisplayedErrorPage) {
   *aDisplayedErrorPage = false;
   // Get prompt and string bundle services
   nsCOMPtr<nsIPrompt> prompter;
   nsCOMPtr<nsIStringBundle> stringBundle;
   GetPromptAndStringBundle(getter_AddRefs(prompter),
@@ -6906,22 +6905,21 @@ nsresult nsDocShell::EndPageLoad(nsIWebP
           // This notification is meant for Firefox Health Report so it
           // can increment counts from the search engine
           MaybeNotifyKeywordSearchLoading(keywordProviderName, keywordAsSent);
 
           nsCOMPtr<nsILoadInfo> loadInfo = aChannel->GetLoadInfo();
           MOZ_ASSERT(loadInfo, "loadInfo is required on all channels");
           nsCOMPtr<nsIPrincipal> triggeringPrincipal =
               loadInfo->TriggeringPrincipal();
-          return LoadURI(newSpecW,              // URI string
-                         LOAD_FLAGS_NONE,       // Load flags
-                         nullptr,               // Referring URI
-                         newPostData,           // Post data stream
-                         nullptr,               // Headers stream
-                         triggeringPrincipal);  // TriggeringPrincipal
+
+          LoadURIOptions loadURIOptions;
+          loadURIOptions.mTriggeringPrincipal = triggeringPrincipal;
+          loadURIOptions.mPostData = newPostData;
+          return LoadURI(newSpecW, loadURIOptions);
         }
       }
     }
 
     // Well, fixup didn't work :-(
     // It is time to throw an error dialog box, and be done with it...
 
     // Errors to be shown only on top-level frames
--- a/docshell/base/nsDocShellTreeOwner.cpp
+++ b/docshell/base/nsDocShellTreeOwner.cpp
@@ -51,16 +51,17 @@
 #include "nsView.h"
 #include "nsIConstraintValidation.h"
 #include "mozilla/Attributes.h"
 #include "mozilla/EventListenerManager.h"
 #include "mozilla/dom/DragEvent.h"
 #include "mozilla/dom/Event.h"     // for Event
 #include "mozilla/dom/File.h"      // for input type=file
 #include "mozilla/dom/FileList.h"  // for input type=file
+#include "mozilla/dom/LoadURIOptionsBinding.h"
 #include "mozilla/TextEvents.h"
 
 using namespace mozilla;
 using namespace mozilla::dom;
 
 // A helper routine that navigates the tricky path from a |nsWebBrowser| to
 // a |EventTarget| via the window root and chrome event handler.
 static nsresult GetDOMEventTarget(nsWebBrowser* aInBrowser,
@@ -891,18 +892,19 @@ nsDocShellTreeOwner::HandleEvent(Event* 
           nsAutoString url;
           if (NS_SUCCEEDED(links[0]->GetUrl(url))) {
             if (!url.IsEmpty()) {
 #ifndef ANDROID
               MOZ_ASSERT(triggeringPrincipal,
                          "nsDocShellTreeOwner::HandleEvent: Need a valid "
                          "triggeringPrincipal");
 #endif
-              webnav->LoadURI(url, 0, nullptr, nullptr, nullptr,
-                              triggeringPrincipal);
+              LoadURIOptions loadURIOptions;
+              loadURIOptions.mTriggeringPrincipal = triggeringPrincipal;
+              webnav->LoadURI(url, loadURIOptions);
             }
           }
 
           for (uint32_t i = 0; i < linksCount; i++) {
             NS_RELEASE(links[i]);
           }
           free(links);
         }
--- a/docshell/base/nsIWebNavigation.idl
+++ b/docshell/base/nsIWebNavigation.idl
@@ -9,18 +9,25 @@ interface nsIInputStream;
 interface nsISHistory;
 interface nsIURI;
 interface nsIPrincipal;
 interface nsIChildSHistory;
 webidl Document;
 
 %{ C++
 #include "mozilla/dom/ChildSHistory.h"
+namespace mozilla {
+namespace dom {
+struct LoadURIOptions;
+} // namespace dom
+} // namespace mozilla
 %}
 
+[ref] native LoadURIOptionsRef(const mozilla::dom::LoadURIOptions);
+
 /**
  * The nsIWebNavigation interface defines an interface for navigating the web.
  * It provides methods and attributes to direct an object to navigate to a new
  * location, stop or restart an in process load, or determine where the object
  * has previously gone.
  */
 [scriptable, uuid(3ade79d4-8cb9-4952-b18d-4f9b63ca0d31)]
 interface nsIWebNavigation : nsISupports
@@ -216,111 +223,38 @@ interface nsIWebNavigation : nsISupports
 
   /**
    * This load is the result of an HTTP redirect.
    */
   const unsigned long LOAD_FLAGS_IS_REDIRECT = 0x800000;
 
   /**
    * Loads a given URI.  This will give priority to loading the requested URI
-   * in the object implementing	this interface.  If it can't be loaded here
+   * in the object implementing this interface.  If it can't be loaded here
    * however, the URI dispatcher will go through its normal process of content
    * loading.
    *
    * @param aURI
    *        The URI string to load.  For HTTP and FTP URLs and possibly others,
    *        characters above U+007F will be converted to UTF-8 and then URL-
    *        escaped per the rules of RFC 2396.
-   * @param aLoadFlags
-   *        Flags modifying load behaviour.  This parameter is a bitwise
-   *        combination of the load flags defined above.  (Undefined bits are
-   *        reserved for future use.)  Generally you will pass LOAD_FLAGS_NONE
-   *        for this parameter.
-   * @param aReferrer
-   *        The referring URI.  If this argument is null, then the referring
-   *        URI will be inferred internally.
-   * @param aPostData
-   *        If the URI corresponds to a HTTP request, then this stream is
-   *        appended directly to the HTTP request headers.  It may be prefixed
-   *        with additional HTTP headers.  This stream must contain a "\r\n"
-   *        sequence separating any HTTP headers from the HTTP request body.
-   *        This parameter is optional and may be null.
-   * @param aHeaders
-   *        If the URI corresponds to a HTTP request, then any HTTP headers
-   *        contained in this stream are set on the HTTP request.  The HTTP
-   *        header stream is formatted as:
-   *            ( HEADER "\r\n" )*
-   *        This parameter is optional and may be null.
-   * @param aTriggeringPrincipal
-   *        The principal that initiated the load of aURI. If omitted docShell
-   *        tries to create a codeBasePrincipal from aReferrer if not null. If
-   *        aReferrer is also null docShell peforms a load using the
-   *        SystemPrincipal as the triggeringPrincipal.
+   * @param aLoadURIOptions
+   *        A JSObject defined in LoadURIOptions.webidl holding info like e.g.
+   *        the triggeringPrincipal, the referrer URI, the referrer policy.
    */
-  void loadURI(in AString                  aURI,
-               in unsigned long            aLoadFlags,
-               in nsIURI                   aReferrer,
-               in nsIInputStream           aPostData,
-               in nsIInputStream           aHeaders,
-               [optional] in nsIPrincipal  aTriggeringPrincipal);
+  [implicit_jscontext, binaryname(LoadURIFromScript)]
+  void loadURI(in AString aURI,
+               in jsval   aLoadURIOptions);
 
   /**
-   * Loads a given URI.  This will give priority to loading the requested URI
-   * in the object implementing this interface.  If it can't be loaded here
-   * however, the URI dispatcher will go through its normal process of content
-   * loading.
-   *
-   * Behaves like loadURI, but allows passing of additional parameters.
-   *
-   * @param aURI
-   *        The URI string to load.  For HTTP and FTP URLs and possibly others,
-   *        characters above U+007F will be converted to UTF-8 and then URL-
-   *        escaped per the rules of RFC 2396.
-   * @param aLoadFlags
-   *        Flags modifying load behaviour.  This parameter is a bitwise
-   *        combination of the load flags defined above.  (Undefined bits are
-   *        reserved for future use.)  Generally you will pass LOAD_FLAGS_NONE
-   *        for this parameter.
-   * @param aReferrer
-   *        The referring URI.  If this argument is null, then the referring
-   *        URI will be inferred internally.
-   * @param aReferrerPolicy
-   *        One of the REFERRER_POLICY_* constants from nsIHttpChannel.
-   *        Normal case is REFERRER_POLICY_NO_REFERRER_WHEN_DOWNGRADE.
-   * @param aPostData
-   *        If the URI corresponds to a HTTP request, then this stream is
-   *        appended directly to the HTTP request headers.  It may be prefixed
-   *        with additional HTTP headers.  This stream must contain a "\r\n"
-   *        sequence separating any HTTP headers from the HTTP request body.
-   *        This parameter is optional and may be null.
-   * @param aHeaders
-   *        If the URI corresponds to a HTTP request, then any HTTP headers
-   *        contained in this stream are set on the HTTP request.  The HTTP
-   *        header stream is formatted as:
-   *            ( HEADER "\r\n" )*
-   *        This parameter is optional and may be null.
-   * @param aBaseURI
-   *        Set to indicate a base URI to be associated with the load. Note
-   *        that at present this argument is only used with view-source aURIs
-   *        and cannot be used to resolve aURI.
-   *        This parameter is optional and may be null.
-   * @param aTriggeringPrincipal
-   *        The principal that initiated the load of aURI. If omitted docShell
-   *        tries to create a codeBasePrincipal from aReferrer if not null. If
-   *        aReferrer is also null docShell peforms a load using the
-   *        SystemPrincipal as the triggeringPrincipal.
+   * A C++ friendly version of loadURI
    */
-  void loadURIWithOptions(in AString                  aURI,
-                          in unsigned long            aLoadFlags,
-                          in nsIURI                   aReferrer,
-                          in unsigned long            aReferrerPolicy,
-                          in nsIInputStream           aPostData,
-                          in nsIInputStream           aHeaders,
-                          in nsIURI                   aBaseURI,
-                          [optional] in nsIPrincipal  aTriggeringPrincipal);
+  [nostdcall, binaryname(LoadURI)]
+  void binaryLoadURI(in AString           aURI,
+                     in LoadURIOptionsRef aLoadURIOptions);
 
   /**
    * Tells the Object to reload the current page.  There may be cases where the
    * user will be asked to confirm the reload (for example, when it is
    * determined that the request is non-idempotent).
    *
    * @param aReloadFlags
    *        Flags modifying load behaviour.  This parameter is a bitwise
--- a/docshell/test/unit/test_setUsePrivateBrowsing.js
+++ b/docshell/test/unit/test_setUsePrivateBrowsing.js
@@ -29,18 +29,20 @@ add_task(async function() {
         "Should be able to change origin attributes prior to a document load");
 
   oa.privateBrowsingId = 0;
   docShell.setOriginAttributes(oa);
 
   equal(loadContext.usePrivateBrowsing, false,
         "Should be able to change origin attributes prior to a document load");
 
-  let systemPrincipal = Services.scriptSecurityManager.getSystemPrincipal();
-  webNav.loadURI("data:text/html,", webNav.LOAD_FLAGS_NONE, null, null, null, systemPrincipal);
+  let loadURIOptions = {
+    triggeringPrincipal: Services.scriptSecurityManager.getSystemPrincipal(),
+  };
+  webNav.loadURI("data:text/html,", loadURIOptions);
 
   // Return to the event loop so the load can begin.
   await new Promise(executeSoon);
 
   // This causes a failed assertion rather than an exception on debug
   // builds.
   if (!AppConstants.DEBUG) {
     Assert.throws(() => { loadContext.usePrivateBrowsing = true; },
--- a/dom/encoding/TextEncoder.cpp
+++ b/dom/encoding/TextEncoder.cpp
@@ -45,14 +45,25 @@ void TextEncoder::Encode(JSContext* aCx,
   if (!outView) {
     aRv.Throw(NS_ERROR_OUT_OF_MEMORY);
     return;
   }
 
   aRetval.set(outView);
 }
 
+void TextEncoder::EncodeInto(const nsAString& aSrc, const Uint8Array& aDst,
+                             TextEncoderEncodeIntoResult& aResult) {
+  aDst.ComputeLengthAndData();
+  size_t read;
+  size_t written;
+  Tie(read, written) = ConvertUTF16toUTF8Partial(
+      aSrc, MakeSpan(reinterpret_cast<char*>(aDst.Data()), aDst.Length()));
+  aResult.mRead.Construct() = read;
+  aResult.mWritten.Construct() = written;
+}
+
 void TextEncoder::GetEncoding(nsAString& aEncoding) {
   aEncoding.AssignLiteral("utf-8");
 }
 
 }  // namespace dom
 }  // namespace mozilla
--- a/dom/encoding/TextEncoder.h
+++ b/dom/encoding/TextEncoder.h
@@ -55,14 +55,17 @@ class TextEncoder final : public NonRefc
    * @param aObj       the wrapper of the TextEncoder
    * @param aString    utf-16 code units to be encoded.
    * @return JSObject* The Uint8Array wrapped in a JS object.  Returned via
    *                   the aRetval out param.
    */
   void Encode(JSContext* aCx, JS::Handle<JSObject*> aObj,
               const nsAString& aString, JS::MutableHandle<JSObject*> aRetval,
               ErrorResult& aRv);
+
+  void EncodeInto(const nsAString& aSrc, const Uint8Array& aDst,
+                  TextEncoderEncodeIntoResult& aResult);
 };
 
 }  // namespace dom
 }  // namespace mozilla
 
 #endif  // mozilla_dom_textencoder_h_
--- a/dom/ipc/TabChild.cpp
+++ b/dom/ipc/TabChild.cpp
@@ -18,16 +18,17 @@
 #include "js/JSON.h"
 #include "mozilla/Preferences.h"
 #include "mozilla/BrowserElementParent.h"
 #include "mozilla/ClearOnShutdown.h"
 #include "mozilla/EventListenerManager.h"
 #include "mozilla/dom/DataTransfer.h"
 #include "mozilla/dom/Event.h"
 #include "mozilla/dom/indexedDB/PIndexedDBPermissionRequestChild.h"
+#include "mozilla/dom/LoadURIOptionsBinding.h"
 #include "mozilla/dom/MessageManagerBinding.h"
 #include "mozilla/dom/MouseEventBinding.h"
 #include "mozilla/dom/Nullable.h"
 #include "mozilla/dom/PaymentRequestChild.h"
 #include "mozilla/dom/WindowProxyHolder.h"
 #include "mozilla/gfx/CrossProcessPaint.h"
 #include "mozilla/IMEStateManager.h"
 #include "mozilla/ipc/URIUtils.h"
@@ -1002,21 +1003,24 @@ mozilla::ipc::IPCResult TabChild::RecvLo
     mDidLoadURLInit = true;
     if (!InitTabChildMessageManager()) {
       return IPC_FAIL_NO_REASON(this);
     }
 
     ApplyShowInfo(aInfo);
   }
 
-  nsresult rv = WebNavigation()->LoadURI(
-      NS_ConvertUTF8toUTF16(aURI),
+  LoadURIOptions loadURIOptions;
+  loadURIOptions.mTriggeringPrincipal = nsContentUtils::GetSystemPrincipal();
+  loadURIOptions.mLoadFlags =
       nsIWebNavigation::LOAD_FLAGS_ALLOW_THIRD_PARTY_FIXUP |
-          nsIWebNavigation::LOAD_FLAGS_DISALLOW_INHERIT_PRINCIPAL,
-      nullptr, nullptr, nullptr, nsContentUtils::GetSystemPrincipal());
+      nsIWebNavigation::LOAD_FLAGS_DISALLOW_INHERIT_PRINCIPAL;
+
+  nsresult rv =
+      WebNavigation()->LoadURI(NS_ConvertUTF8toUTF16(aURI), loadURIOptions);
   if (NS_FAILED(rv)) {
     NS_WARNING(
         "WebNavigation()->LoadURI failed. Eating exception, what else can I "
         "do?");
   }
 
   CrashReporter::AnnotateCrashReport(CrashReporter::Annotation::URL, aURI);
 
--- a/dom/locales/en-US/chrome/layout/htmlparser.properties
+++ b/dom/locales/en-US/chrome/layout/htmlparser.properties
@@ -78,16 +78,17 @@ errExpectedSystemId=Expected a system id
 errMissingSpaceBeforeDoctypeName=Missing space before doctype name.
 errHyphenHyphenBang=“--!” found in comment.
 errNcrZero=Character reference expands to zero.
 errNoSpaceBetweenDoctypeSystemKeywordAndQuote=No space between the doctype “SYSTEM” keyword and the quote.
 errNoSpaceBetweenPublicAndSystemIds=No space between the doctype public and system identifiers.
 errNoSpaceBetweenDoctypePublicKeywordAndQuote=No space between the doctype “PUBLIC” keyword and the quote.
 
 # Tree builder errors
+errDeepTree=The document tree is too deep. The tree will be flattened to be 513 elements deep.
 errStrayStartTag2=Stray start tag “%1$S”.
 errStrayEndTag=Stray end tag “%1$S”.
 errUnclosedElements=End tag “%1$S” seen, but there were open elements.
 errUnclosedElementsImplied=End tag “%1$S” implied, but there were open elements.
 errUnclosedElementsCell=A table cell was implicitly closed, but there were open elements.
 errStrayDoctype=Stray doctype.
 errAlmostStandardsDoctype=Almost standards mode doctype. Expected “<!DOCTYPE html>”.
 errQuirkyDoctype=Quirky doctype. Expected “<!DOCTYPE html>”.
--- a/dom/reporting/ReportingHeader.cpp
+++ b/dom/reporting/ReportingHeader.cpp
@@ -20,16 +20,19 @@
 #include "nsIHttpProtocolHandler.h"
 #include "nsIObserverService.h"
 #include "nsIPrincipal.h"
 #include "nsIRandomGenerator.h"
 #include "nsIScriptError.h"
 #include "nsNetUtil.h"
 #include "nsXULAppAPI.h"
 
+#define REPORTING_PURGE_ALL "reporting:purge-all"
+#define REPORTING_PURGE_HOST "reporting:purge-host"
+
 namespace mozilla {
 namespace dom {
 
 namespace {
 
 StaticRefPtr<ReportingHeader> gReporting;
 
 }  // namespace
@@ -46,19 +49,19 @@ StaticRefPtr<ReportingHeader> gReporting
 
   nsCOMPtr<nsIObserverService> obs = services::GetObserverService();
   if (NS_WARN_IF(!obs)) {
     return;
   }
 
   obs->AddObserver(service, NS_HTTP_ON_EXAMINE_RESPONSE_TOPIC, false);
   obs->AddObserver(service, NS_XPCOM_SHUTDOWN_OBSERVER_ID, false);
-  obs->AddObserver(service, "browser:purge-domain-data", false);
   obs->AddObserver(service, "clear-origin-attributes-data", false);
-  obs->AddObserver(service, "extension:purge-localStorage", false);
+  obs->AddObserver(service, REPORTING_PURGE_HOST, false);
+  obs->AddObserver(service, REPORTING_PURGE_ALL, false);
 
   gReporting = service;
 }
 
 /* static */ void ReportingHeader::Shutdown() {
   MOZ_ASSERT(NS_IsMainThread());
 
   if (!gReporting) {
@@ -75,19 +78,19 @@ StaticRefPtr<ReportingHeader> gReporting
 
   nsCOMPtr<nsIObserverService> obs = services::GetObserverService();
   if (NS_WARN_IF(!obs)) {
     return;
   }
 
   obs->RemoveObserver(service, NS_HTTP_ON_EXAMINE_RESPONSE_TOPIC);
   obs->RemoveObserver(service, NS_XPCOM_SHUTDOWN_OBSERVER_ID);
-  obs->RemoveObserver(service, "browser:purge-domain-data");
   obs->RemoveObserver(service, "clear-origin-attributes-data");
-  obs->RemoveObserver(service, "extension:purge-localStorage");
+  obs->RemoveObserver(service, REPORTING_PURGE_HOST);
+  obs->RemoveObserver(service, REPORTING_PURGE_ALL);
 }
 
 ReportingHeader::ReportingHeader() = default;
 ReportingHeader::~ReportingHeader() = default;
 
 NS_IMETHODIMP
 ReportingHeader::Observe(nsISupports* aSubject, const char* aTopic,
                          const char16_t* aData) {
@@ -106,33 +109,33 @@ ReportingHeader::Observe(nsISupports* aS
     if (NS_WARN_IF(!channel)) {
       return NS_OK;
     }
 
     ReportingFromChannel(channel);
     return NS_OK;
   }
 
-  if (!strcmp(aTopic, "browser:purge-domain-data")) {
+  if (!strcmp(aTopic, REPORTING_PURGE_HOST)) {
     RemoveOriginsFromHost(nsDependentString(aData));
     return NS_OK;
   }
 
   if (!strcmp(aTopic, "clear-origin-attributes-data")) {
     OriginAttributesPattern pattern;
     if (!pattern.Init(nsDependentString(aData))) {
       NS_ERROR("Cannot parse origin attributes pattern");
       return NS_ERROR_FAILURE;
     }
 
     RemoveOriginsFromOriginAttributesPattern(pattern);
     return NS_OK;
   }
 
-  if (!strcmp(aTopic, "extension:purge-localStorage")) {
+  if (!strcmp(aTopic, REPORTING_PURGE_ALL)) {
     RemoveOrigins();
     return NS_OK;
   }
 
   return NS_ERROR_FAILURE;
 }
 
 void ReportingHeader::ReportingFromChannel(nsIHttpChannel* aChannel) {
--- a/dom/reporting/tests/browser_cleanup.js
+++ b/dom/reporting/tests/browser_cleanup.js
@@ -62,20 +62,20 @@ add_task(async function() {
   await BrowserTestUtils.browserLoaded(browser);
 
   ok(!ChromeUtils.hasReportingHeaderForOrigin(TEST_DOMAIN), "No data before the test");
 
   await storeReportingHeader(browser);
   ok(ChromeUtils.hasReportingHeaderForOrigin(TEST_DOMAIN), "We have data");
 
   await new Promise(resolve => {
-    Services.clearData.deleteData(Ci.nsIClearDataService.CLEAR_DOM_QUOTA, value => resolve());
+    Services.clearData.deleteData(Ci.nsIClearDataService.CLEAR_REPORTS, value => resolve());
   });
 
-  ok(!ChromeUtils.hasReportingHeaderForOrigin(TEST_DOMAIN), "No data before a quota cleanup");
+  ok(!ChromeUtils.hasReportingHeaderForOrigin(TEST_DOMAIN), "No data before a reports cleanup");
 
   info("Removing the tab");
   BrowserTestUtils.removeTab(tab);
 });
 
 add_task(async function() {
   info("Testing a QuotaManager host cleanup");
 
@@ -86,20 +86,20 @@ add_task(async function() {
   await BrowserTestUtils.browserLoaded(browser);
 
   ok(!ChromeUtils.hasReportingHeaderForOrigin(TEST_DOMAIN), "No data before the test");
 
   await storeReportingHeader(browser);
   ok(ChromeUtils.hasReportingHeaderForOrigin(TEST_DOMAIN), "We have data");
 
   await new Promise(resolve => {
-    Services.clearData.deleteDataFromHost(TEST_HOST, true, Ci.nsIClearDataService.CLEAR_DOM_QUOTA, value => resolve());
+    Services.clearData.deleteDataFromHost(TEST_HOST, true, Ci.nsIClearDataService.CLEAR_REPORTS, value => resolve());
   });
 
-  ok(!ChromeUtils.hasReportingHeaderForOrigin(TEST_DOMAIN), "No data before a quota cleanup");
+  ok(!ChromeUtils.hasReportingHeaderForOrigin(TEST_DOMAIN), "No data before a reports cleanup");
 
   info("Removing the tab");
   BrowserTestUtils.removeTab(tab);
 });
 
 add_task(async function() {
   info("Testing a 410 endpoint status");
 
--- a/dom/security/FramingChecker.cpp
+++ b/dom/security/FramingChecker.cpp
@@ -10,16 +10,17 @@
 #include "nsDocShell.h"
 #include "nsIChannel.h"
 #include "nsIConsoleService.h"
 #include "nsIContentSecurityPolicy.h"
 #include "nsIScriptError.h"
 #include "nsNetUtil.h"
 #include "nsQueryObject.h"
 #include "mozilla/dom/nsCSPUtils.h"
+#include "mozilla/dom/LoadURIOptionsBinding.h"
 #include "mozilla/NullPrincipal.h"
 
 using namespace mozilla;
 
 /* static */ bool FramingChecker::CheckOneFrameOptionsPolicy(
     nsIHttpChannel* aHttpChannel, const nsAString& aPolicy,
     nsIDocShell* aDocShell) {
   static const char allowFrom[] = "allow-from";
@@ -252,18 +253,20 @@ static bool ShouldIgnoreFrameOptions(nsI
         nsCOMPtr<nsIWebNavigation> webNav(do_QueryObject(aDocShell));
         if (webNav) {
           nsCOMPtr<nsILoadInfo> loadInfo = httpChannel->GetLoadInfo();
           MOZ_ASSERT(loadInfo);
 
           RefPtr<NullPrincipal> principal =
               NullPrincipal::CreateWithInheritedAttributes(
                   loadInfo->TriggeringPrincipal());
-          webNav->LoadURI(NS_LITERAL_STRING("about:blank"), 0, nullptr, nullptr,
-                          nullptr, principal);
+
+          LoadURIOptions loadURIOptions;
+          loadURIOptions.mTriggeringPrincipal = principal;
+          webNav->LoadURI(NS_LITERAL_STRING("about:blank"), loadURIOptions);
         }
       }
       return false;
     }
   }
 
   return true;
 }
new file mode 100644
--- /dev/null
+++ b/dom/webidl/LoadURIOptions.webidl
@@ -0,0 +1,60 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+interface Principal;
+interface URI;
+interface InputStream;
+
+/**
+ * This dictionary holds load arguments for docshell loads.
+ */
+
+dictionary LoadURIOptions {
+  /**
+   * The principal that initiated the load.
+   */
+  Principal? triggeringPrincipal = null;
+
+  /**
+   * Flags modifying load behaviour.  This parameter is a bitwise
+   * combination of the load flags defined in nsIWebNavigation.idl.
+   */
+   long loadFlags = 0;
+
+  /**
+   * The referring URI.  If this argument is null, then the referring
+   * URI will be inferred internally.
+   */
+  URI? referrerURI = null;
+
+  /**
+   * Referrer Policy for the load, defaults to REFERRER_POLICY_UNSET.
+   * Alternatively use one of REFERRER_POLICY_* constants from
+   * nsIHttpChannel.
+   */
+  long referrerPolicy = 0;
+
+  /**
+   * If the URI to be loaded corresponds to a HTTP request, then this stream is
+   * appended directly to the HTTP request headers.  It may be prefixed
+   * with additional HTTP headers.  This stream must contain a "\r\n"
+   * sequence separating any HTTP headers from the HTTP request body.
+   */
+  InputStream? postData = null;
+
+  /**
+   * If the URI corresponds to a HTTP request, then any HTTP headers
+   * contained in this stream are set on the HTTP request.  The HTTP
+   * header stream is formatted as:
+   *     ( HEADER "\r\n" )*
+   */
+   InputStream? headers = null;
+
+  /**
+   * Set to indicate a base URI to be associated with the load. Note
+   * that at present this argument is only used with view-source aURIs
+   * and cannot be used to resolve aURI.
+   */
+  URI? baseURI = null;
+};
\ No newline at end of file
--- a/dom/webidl/TextEncoder.webidl
+++ b/dom/webidl/TextEncoder.webidl
@@ -5,23 +5,33 @@
  *
  * The origin of this IDL file is
  * http://encoding.spec.whatwg.org/#interface-textencoder
  *
  * Any copyright is dedicated to the Public Domain.
  * http://creativecommons.org/publicdomain/zero/1.0/
  */
 
+dictionary TextEncoderEncodeIntoResult {
+  unsigned long long read;
+  unsigned long long written;
+};
+
 [Constructor, Exposed=(Window,Worker)]
 interface TextEncoder {
   [Constant]
   readonly attribute DOMString encoding;
   /*
    * This is spec-wise USVString but marking it as
    * DOMString to avoid duplicate work. Since the
    * UTF-16 to UTF-8 converter performs processing
    * that's equivalent to first converting a
    * DOMString to a USVString, let's avoid having
    * the binding code doing it, too.
    */
   [NewObject]
   Uint8Array encode(optional DOMString input = "");
+
+  /*
+   * The same comment about USVString as above applies here.
+   */
+  TextEncoderEncodeIntoResult encodeInto(DOMString source, Uint8Array destination);
 };
--- a/dom/webidl/moz.build
+++ b/dom/webidl/moz.build
@@ -628,16 +628,17 @@ WEBIDL_FILES = [
     'KeyboardEvent.webidl',
     'KeyEvent.webidl',
     'KeyframeAnimationOptions.webidl',
     'KeyframeEffect.webidl',
     'KeyIdsInitData.webidl',
     'L10nUtils.webidl',
     'LegacyQueryInterface.webidl',
     'LinkStyle.webidl',
+    'LoadURIOptions.webidl',
     'Location.webidl',
     'MediaCapabilities.webidl',
     'MediaDeviceInfo.webidl',
     'MediaDevices.webidl',
     'MediaElementAudioSourceNode.webidl',
     'MediaEncryptedEvent.webidl',
     'MediaError.webidl',
     'MediaKeyError.webidl',
--- a/dom/workers/RuntimeService.cpp
+++ b/dom/workers/RuntimeService.cpp
@@ -281,17 +281,17 @@ void LoadContextOptions(const char* aPre
       .setWasm(GetWorkerPref<bool>(NS_LITERAL_CSTRING("wasm")))
       .setWasmBaseline(
           GetWorkerPref<bool>(NS_LITERAL_CSTRING("wasm_baselinejit")))
       .setWasmIon(GetWorkerPref<bool>(NS_LITERAL_CSTRING("wasm_ionjit")))
 #ifdef ENABLE_WASM_CRANELIFT
       .setWasmForceCranelift(
           GetWorkerPref<bool>(NS_LITERAL_CSTRING("wasm_cranelift")))
 #endif
-#ifdef ENABLE_WASM_GC
+#ifdef ENABLE_WASM_REFTYPES
       .setWasmGc(GetWorkerPref<bool>(NS_LITERAL_CSTRING("wasm_gc")))
 #endif
       .setWasmVerbose(GetWorkerPref<bool>(NS_LITERAL_CSTRING("wasm_verbose")))
       .setThrowOnAsmJSValidationFailure(GetWorkerPref<bool>(
           NS_LITERAL_CSTRING("throw_on_asmjs_validation_failure")))
       .setBaseline(GetWorkerPref<bool>(NS_LITERAL_CSTRING("baselinejit")))
       .setIon(GetWorkerPref<bool>(NS_LITERAL_CSTRING("ion")))
       .setNativeRegExp(GetWorkerPref<bool>(NS_LITERAL_CSTRING("native_regexp")))
--- a/dom/workers/moz.build
+++ b/dom/workers/moz.build
@@ -95,9 +95,10 @@ MOCHITEST_CHROME_MANIFESTS += [
 XPCSHELL_TESTS_MANIFESTS += ['test/xpcshell/xpcshell.ini']
 
 BROWSER_CHROME_MANIFESTS += ['test/browser.ini']
 
 if CONFIG['CC_TYPE'] in ('clang', 'gcc'):
     CXXFLAGS += ['-Wno-error=shadow']
 
 if CONFIG['NIGHTLY_BUILD']:
+    DEFINES['ENABLE_WASM_REFTYPES'] = True
     DEFINES['ENABLE_WASM_GC'] = True
--- a/editor/composer/nsEditingSession.cpp
+++ b/editor/composer/nsEditingSession.cpp
@@ -45,16 +45,17 @@
 #include "nsPICommandUpdater.h"          // for nsPICommandUpdater
 #include "nsPIDOMWindow.h"               // for nsPIDOMWindow
 #include "nsPresContext.h"               // for nsPresContext
 #include "nsReadableUtils.h"             // for AppendUTF16toUTF8
 #include "nsStringFwd.h"                 // for nsString
 #include "mozilla/dom/Selection.h"       // for AutoHideSelectionChanges, etc
 #include "nsFrameSelection.h"            // for nsFrameSelection
 #include "nsBaseCommandController.h"     // for nsBaseCommandController
+#include "mozilla/dom/LoadURIOptionsBinding.h"
 
 class nsISupports;
 class nsIURI;
 
 using namespace mozilla;
 using namespace mozilla::dom;
 
 /*---------------------------------------------------------------------------
@@ -935,18 +936,20 @@ nsresult nsEditingSession::EndDocumentLo
 }
 
 void nsEditingSession::TimerCallback(nsITimer* aTimer, void* aClosure) {
   nsCOMPtr<nsIDocShell> docShell =
       do_QueryReferent(static_cast<nsIWeakReference*>(aClosure));
   if (docShell) {
     nsCOMPtr<nsIWebNavigation> webNav(do_QueryInterface(docShell));
     if (webNav) {
-      webNav->LoadURI(NS_LITERAL_STRING("about:blank"), 0, nullptr, nullptr,
-                      nullptr, nsContentUtils::GetSystemPrincipal());
+      LoadURIOptions loadURIOptions;
+      loadURIOptions.mTriggeringPrincipal =
+          nsContentUtils::GetSystemPrincipal();
+      webNav->LoadURI(NS_LITERAL_STRING("about:blank"), loadURIOptions);
     }
   }
 }
 
 /*---------------------------------------------------------------------------
 
   StartPageLoad
 
--- a/gfx/tests/browser/browser_windowless_troubleshoot_crash.js
+++ b/gfx/tests/browser/browser_windowless_troubleshoot_crash.js
@@ -13,18 +13,20 @@ add_task(async function test_windowlessB
           if (docShell === observedDocShell) {
             Services.obs.removeObserver(listener, "content-document-global-created");
             resolve();
           }
         },
     };
     Services.obs.addObserver(listener, "content-document-global-created");
   });
-  let triggeringPrincipal = Services.scriptSecurityManager.createNullPrincipal({});
-  webNav.loadURI("about:blank", 0, null, null, null, triggeringPrincipal);
+  let loadURIOptions = {
+    triggeringPrincipal: Services.scriptSecurityManager.createNullPrincipal({}),
+  };
+  webNav.loadURI("about:blank", loadURIOptions);
 
   await onLoaded;
 
   let winUtils = webNav.document.defaultView.windowUtils;
   try {
     is(winUtils.layerManagerType, "Basic", "windowless browser's layerManagerType should be 'Basic'");
   } catch (e) {
     // The windowless browser may not have a layermanager at all yet, and that's ok.
--- a/intl/encoding_glue/src/lib.rs
+++ b/intl/encoding_glue/src/lib.rs
@@ -598,16 +598,31 @@ pub unsafe extern "C" fn encoding_mem_co
 ) -> usize {
     encoding_rs::mem::convert_utf16_to_utf8(
         ::std::slice::from_raw_parts(src, src_len),
         ::std::slice::from_raw_parts_mut(dst, dst_len),
     )
 }
 
 #[no_mangle]
+pub unsafe extern "C" fn encoding_mem_convert_utf16_to_utf8_partial(
+    src: *const u16,
+    src_len: *mut usize,
+    dst: *mut u8,
+    dst_len: *mut usize,
+) {
+    let (read, written) = encoding_rs::mem::convert_utf16_to_utf8_partial(
+        ::std::slice::from_raw_parts(src, *src_len),
+        ::std::slice::from_raw_parts_mut(dst, *dst_len),
+    );
+    *src_len = read;
+    *dst_len = written;
+}
+
+#[no_mangle]
 pub unsafe extern "C" fn encoding_mem_convert_utf8_to_utf16(
     src: *const u8,
     src_len: usize,
     dst: *mut u16,
     dst_len: usize,
 ) -> usize {
     encoding_rs::mem::convert_utf8_to_utf16(
         ::std::slice::from_raw_parts(src, src_len),
--- a/js/src/builtin/TestingFunctions.cpp
+++ b/js/src/builtin/TestingFunctions.cpp
@@ -665,42 +665,38 @@ static bool WasmBulkMemSupported(JSConte
 #endif
 #else
   bool isSupported = false;
 #endif
   args.rval().setBoolean(isSupported);
   return true;
 }
 
-static bool TestGCEnabled(JSContext* cx) {
-#ifdef ENABLE_WASM_GC
-  bool isSupported = cx->options().wasmBaseline() && cx->options().wasmGc();
-#ifdef ENABLE_WASM_CRANELIFT
-  if (cx->options().wasmForceCranelift()) {
-    isSupported = false;
-  }
-#endif
-  return isSupported;
-#else
-  return false;
-#endif
+static bool WasmReftypesEnabled(JSContext* cx, unsigned argc, Value* vp) {
+  CallArgs args = CallArgsFromVp(argc, vp);
+  args.rval().setBoolean(wasm::HasReftypesSupport(cx));
+  return true;
 }
 
 static bool WasmGcEnabled(JSContext* cx, unsigned argc, Value* vp) {
   CallArgs args = CallArgsFromVp(argc, vp);
-  args.rval().setBoolean(TestGCEnabled(cx));
+#ifdef ENABLE_WASM_GC
+  args.rval().setBoolean(wasm::HasReftypesSupport(cx));
+#else
+  args.rval().setBoolean(false);
+#endif
   return true;
 }
 
 static bool WasmGeneralizedTables(JSContext* cx, unsigned argc, Value* vp) {
   CallArgs args = CallArgsFromVp(argc, vp);
 #ifdef ENABLE_WASM_GENERALIZED_TABLES
   // Generalized tables depend on anyref, though not currently on (ref T)
   // types nor on structures or other GC-proposal features.
-  bool isSupported = TestGCEnabled(cx);
+  bool isSupported = wasm::HasReftypesSupport(cx);
 #else
   bool isSupported = false;
 #endif
   args.rval().setBoolean(isSupported);
   return true;
 }
 
 static bool WasmCompileMode(JSContext* cx, unsigned argc, Value* vp) {
@@ -5966,19 +5962,23 @@ gc::ZealModeHelpText),
 "  cannot be satisfied then null is returned.  If the request is 'ion' then block\n"
 "  until background compilation is complete."),
 
     JS_FN_HELP("wasmHasTier2CompilationCompleted", WasmHasTier2CompilationCompleted, 1, 0,
 "wasmHasTier2CompilationCompleted(module)",
 "  Returns a boolean indicating whether a given module has finished compiled code for tier2. \n"
 "This will return true early if compilation isn't two-tiered. "),
 
+    JS_FN_HELP("wasmReftypesEnabled", WasmReftypesEnabled, 1, 0,
+"wasmReftypesEnabled(bool)",
+"  Returns a boolean indicating whether the WebAssembly reftypes proposal is enabled."),
+
     JS_FN_HELP("wasmGcEnabled", WasmGcEnabled, 1, 0,
 "wasmGcEnabled(bool)",
-"  Returns a boolean indicating whether the WebAssembly GC support is enabled."),
+"  Returns a boolean indicating whether the WebAssembly GC types proposal is enabled."),
 
     JS_FN_HELP("wasmGeneralizedTables", WasmGeneralizedTables, 1, 0,
 "wasmGeneralizedTables(bool)",
 "  Returns a boolean indicating whether generalized tables are available.\n"
 "  This feature set includes 'anyref' as a table type, and new instructions\n"
 "  including table.get, table.set, table.grow, and table.size."),
 
     JS_FN_HELP("isLazyFunction", IsLazyFunction, 1, 0,
--- a/js/src/jit-test/tests/wasm/gc/anyref-boxing.js
+++ b/js/src/jit-test/tests/wasm/gc/anyref-boxing.js
@@ -1,9 +1,9 @@
-// |jit-test| skip-if: !wasmGcEnabled()
+// |jit-test| skip-if: !wasmReftypesEnabled()
 
 // Moving a JS value through a wasm anyref is a pair of boxing/unboxing
 // conversions that leaves the value unchanged.  There are many cases,
 // along these axes:
 //
 //  - global variables
 //  - tables
 //  - function parameters and returns
--- a/js/src/jit-test/tests/wasm/gc/anyref-global-object.js
+++ b/js/src/jit-test/tests/wasm/gc/anyref-global-object.js
@@ -1,9 +1,9 @@
-// |jit-test| skip-if: !wasmGcEnabled() || typeof WebAssembly.Global !== 'function'
+// |jit-test| skip-if: !wasmReftypesEnabled() || typeof WebAssembly.Global !== 'function'
 
 // Dummy object.
 function Baguette(calories) {
     this.calories = calories;
 }
 
 assertEq(new WebAssembly.Global({value: "anyref"}) instanceof WebAssembly.Global, true);
 
--- a/js/src/jit-test/tests/wasm/gc/anyref-global-postbarrier.js
+++ b/js/src/jit-test/tests/wasm/gc/anyref-global-postbarrier.js
@@ -1,9 +1,9 @@
-// |jit-test| skip-if: !wasmGcEnabled()
+// |jit-test| skip-if: !wasmReftypesEnabled()
 
 const { startProfiling, endProfiling, assertEqPreciseStacks, isSingleStepProfilingEnabled } = WasmHelpers;
 
 // Dummy constructor.
 function Baguette(calories) {
     this.calories = calories;
 }
 
--- a/js/src/jit-test/tests/wasm/gc/anyref-global-prebarrier.js
+++ b/js/src/jit-test/tests/wasm/gc/anyref-global-prebarrier.js
@@ -1,9 +1,9 @@
-// |jit-test| skip-if: !wasmGcEnabled()
+// |jit-test| skip-if: !wasmReftypesEnabled()
 
 // Do not run the test if we're jit-compiling JS, since it's the wasm frames
 // we're interested in and eager JS compilation can upset the test.
 
 opts = getJitCompilerOptions();
 if (opts['ion.enable'] || opts['baseline.enable'])
   quit();
 
new file mode 100644
--- /dev/null
+++ b/js/src/jit-test/tests/wasm/gc/anyref-refeq.js
@@ -0,0 +1,22 @@
+// |jit-test| skip-if: !wasmGcEnabled()
+//
+// ref.eq is part of the gc feature, not the reftypes feature.
+
+let { exports } = wasmEvalText(`(module
+    (gc_feature_opt_in 2)
+
+    (func (export "ref_eq") (param $a anyref) (param $b anyref) (result i32)
+        (ref.eq (get_local $a) (get_local $b)))
+
+    (func (export "ref_eq_for_control") (param $a anyref) (param $b anyref) (result f64)
+        (if f64 (ref.eq (get_local $a) (get_local $b))
+            (f64.const 5.0)
+            (f64.const 3.0))))`);
+
+assertEq(exports.ref_eq(null, null), 1);
+assertEq(exports.ref_eq(null, {}), 0);
+assertEq(exports.ref_eq(this, this), 1);
+assertEq(exports.ref_eq_for_control(null, null), 5);
+assertEq(exports.ref_eq_for_control(null, {}), 3);
+assertEq(exports.ref_eq_for_control(this, this), 5);
+
--- a/js/src/jit-test/tests/wasm/gc/anyref-val-tracing.js
+++ b/js/src/jit-test/tests/wasm/gc/anyref-val-tracing.js
@@ -1,9 +1,9 @@
-// |jit-test| skip-if: !wasmGcEnabled()
+// |jit-test| skip-if: !wasmReftypesEnabled()
 
 gczeal(14, 1);
 let { exports } = wasmEvalText(`(module
     (gc_feature_opt_in 2)
     (global $anyref (import "glob" "anyref") anyref)
     (func (export "get") (result anyref) get_global $anyref)
 )`, {
     glob: {
--- a/js/src/jit-test/tests/wasm/gc/anyref.js
+++ b/js/src/jit-test/tests/wasm/gc/anyref.js
@@ -1,10 +1,9 @@
-// |jit-test| skip-if: !wasmGcEnabled()
-// Ensure that if gc types aren't enabled, test cases properly fail.
+// |jit-test| skip-if: !wasmReftypesEnabled()
 
 // Dummy constructor.
 function Baguette(calories) {
     this.calories = calories;
 }
 
 // Type checking.
 
@@ -85,35 +84,21 @@ let { exports } = wasmEvalText(`(module
         ref.null
         set_local 0
         i32.const 58
         call $sum
         drop
         get_local 0
         ref.is_null
     )
-
-    (func (export "ref_eq") (param $a anyref) (param $b anyref) (result i32)
-	  (ref.eq (get_local $a) (get_local $b)))
-
-    (func (export "ref_eq_for_control") (param $a anyref) (param $b anyref) (result f64)
-	  (if f64 (ref.eq (get_local $a) (get_local $b))
-	      (f64.const 5.0)
-	      (f64.const 3.0)))
     )`);
 
 assertEq(exports.is_null(), 1);
 assertEq(exports.is_null_spill(), 1);
 assertEq(exports.is_null_local(), 1);
-assertEq(exports.ref_eq(null, null), 1);
-assertEq(exports.ref_eq(null, {}), 0);
-assertEq(exports.ref_eq(this, this), 1);
-assertEq(exports.ref_eq_for_control(null, null), 5);
-assertEq(exports.ref_eq_for_control(null, {}), 3);
-assertEq(exports.ref_eq_for_control(this, this), 5);
 
 // Anyref param and result in wasm functions.
 
 exports = wasmEvalText(`(module
     (gc_feature_opt_in 2)
     (func (export "is_null") (result i32) (param $ref anyref)
         get_local $ref
         ref.is_null
--- a/js/src/jit-test/tests/wasm/gc/binary.js
+++ b/js/src/jit-test/tests/wasm/gc/binary.js
@@ -1,9 +1,9 @@
-// |jit-test| skip-if: !wasmGcEnabled()
+// |jit-test| skip-if: !wasmReftypesEnabled()
 
 load(libdir + "wasm-binary.js");
 
 const v2vSig = {args:[], ret:VoidCode};
 const v2vSigSection = sigSection([v2vSig]);
 
 function checkInvalid(body, errorMessage) {
     assertErrorMessage(() => new WebAssembly.Module(
--- a/js/src/jit-test/tests/wasm/gc/debugger.js
+++ b/js/src/jit-test/tests/wasm/gc/debugger.js
@@ -1,9 +1,9 @@
-// |jit-test| skip-if: !wasmGcEnabled() || !wasmDebuggingIsSupported()
+// |jit-test| skip-if: !wasmReftypesEnabled() || !wasmDebuggingIsSupported()
 
 (function() {
     let g = newGlobal();
     let dbg = new Debugger(g);
     g.eval(`o = new WebAssembly.Instance(new WebAssembly.Module(wasmTextToBinary('(module (gc_feature_opt_in 2) (func (result anyref) (param anyref) get_local 0) (export "" 0))')));`);
 })();
 
 (function() {
new file mode 100644
--- /dev/null
+++ b/js/src/jit-test/tests/wasm/gc/disabled-ref.js
@@ -0,0 +1,4 @@
+// |jit-test| skip-if: wasmGcEnabled()
+
+assertErrorMessage(() => wasmEvalText(`(module (func (param (ref 0)) (unreachable)))`),
+                   WebAssembly.CompileError, /reference types not enabled/);
--- a/js/src/jit-test/tests/wasm/gc/disabled.js
+++ b/js/src/jit-test/tests/wasm/gc/disabled.js
@@ -1,9 +1,9 @@
-// |jit-test| skip-if: wasmGcEnabled()
+// |jit-test| skip-if: wasmReftypesEnabled()
 
 const { CompileError, validate } = WebAssembly;
 
 const UNRECOGNIZED_OPCODE_OR_BAD_TYPE = /unrecognized opcode|(Structure|reference) types not enabled|invalid inline block type/;
 
 function assertValidateError(text) {
     assertEq(validate(wasmTextToBinary(text)), false);
 }
--- a/js/src/jit-test/tests/wasm/gc/fuzz-gc-while-allocating-global.js
+++ b/js/src/jit-test/tests/wasm/gc/fuzz-gc-while-allocating-global.js
@@ -1,5 +1,5 @@
-// |jit-test| skip-if: !wasmGcEnabled()
+// |jit-test| skip-if: !wasmReftypesEnabled()
 
 enableShellAllocationMetadataBuilder();
 gczeal(9, 1);
 new WebAssembly.Global({ value: 'i32' }, 42);
new file mode 100644
--- /dev/null
+++ b/js/src/jit-test/tests/wasm/gc/gc-feature-opt-in-struct.js
@@ -0,0 +1,41 @@
+// |jit-test| skip-if: !wasmGcEnabled()
+//
+// Struct types are only available if we opt in, so test that.
+
+let CURRENT_VERSION = 2;
+
+new WebAssembly.Module(wasmTextToBinary(
+    `(module
+       (gc_feature_opt_in ${CURRENT_VERSION})
+      (type (struct (field i32))))`));
+
+assertErrorMessage(() => new WebAssembly.Module(wasmTextToBinary(
+    `(module
+      (type (struct (field i32))))`)),
+                   WebAssembly.CompileError,
+                   /Structure types not enabled/);
+
+assertErrorMessage(() => new WebAssembly.Module(wasmTextToBinary(
+    `(module
+      (func (struct.new 0)))`)),
+                   WebAssembly.CompileError,
+                   /unrecognized opcode/);
+
+assertErrorMessage(() => new WebAssembly.Module(wasmTextToBinary(
+    `(module
+      (func (struct.get 0 0)))`)),
+                   WebAssembly.CompileError,
+                   /unrecognized opcode/);
+
+assertErrorMessage(() => new WebAssembly.Module(wasmTextToBinary(
+    `(module
+      (func (struct.set 0 0)))`)),
+                   WebAssembly.CompileError,
+                   /unrecognized opcode/);
+
+assertErrorMessage(() => new WebAssembly.Module(wasmTextToBinary(
+    `(module
+      (func (struct.narrow anyref anyref)))`)),
+                   WebAssembly.CompileError,
+                   /unrecognized opcode/);
+
--- a/js/src/jit-test/tests/wasm/gc/gc-feature-opt-in.js
+++ b/js/src/jit-test/tests/wasm/gc/gc-feature-opt-in.js
@@ -1,9 +1,11 @@
-// |jit-test| skip-if: !wasmGcEnabled()
+// |jit-test| skip-if: !wasmReftypesEnabled()
+//
+// Also see gc-feature-opt-in-struct.js for tests that use the struct feature.
 
 // Version numbers
 
 let CURRENT_VERSION = 2;
 let OLDER_INCOMPATIBLE_VERSION = 1; // v1 incompatible with v2
 let FUTURE_VERSION = 3;
 
 // Encoding.  If the section is present it must be first.
@@ -39,29 +41,16 @@ assertErrorMessage(() => new WebAssembly
                    /GC feature version \d+ is no longer supported by this engine/);
 
 assertErrorMessage(() => new WebAssembly.Module(wasmTextToBinary(
     `(module
       (gc_feature_opt_in ${FUTURE_VERSION}))`)),
                    WebAssembly.CompileError,
                    /GC feature version is unknown/);
 
-// Struct types are only available if we opt in.
-
-new WebAssembly.Module(wasmTextToBinary(
-    `(module
-      (gc_feature_opt_in ${CURRENT_VERSION})
-      (type (struct (field i32))))`));
-
-assertErrorMessage(() => new WebAssembly.Module(wasmTextToBinary(
-    `(module
-      (type (struct (field i32))))`)),
-                   WebAssembly.CompileError,
-                   /Structure types not enabled/);
-
 // Parameters of ref type are only available if we opt in.
 
 new WebAssembly.Module(wasmTextToBinary(
     `(module
       (gc_feature_opt_in ${CURRENT_VERSION})
       (type (func (param anyref))))`));
 
 assertErrorMessage(() => new WebAssembly.Module(wasmTextToBinary(
@@ -132,31 +121,8 @@ assertErrorMessage(() => new WebAssembly
                    /unrecognized opcode/);
 
 assertErrorMessage(() => new WebAssembly.Module(wasmTextToBinary(
     `(module
       (func ref.eq))`)),
                    WebAssembly.CompileError,
                    /unrecognized opcode/);
 
-assertErrorMessage(() => new WebAssembly.Module(wasmTextToBinary(
-    `(module
-      (func (struct.new 0)))`)),
-                   WebAssembly.CompileError,
-                   /unrecognized opcode/);
-
-assertErrorMessage(() => new WebAssembly.Module(wasmTextToBinary(
-    `(module
-      (func (struct.get 0 0)))`)),
-                   WebAssembly.CompileError,
-                   /unrecognized opcode/);
-
-assertErrorMessage(() => new WebAssembly.Module(wasmTextToBinary(
-    `(module
-      (func (struct.set 0 0)))`)),
-                   WebAssembly.CompileError,
-                   /unrecognized opcode/);
-
-assertErrorMessage(() => new WebAssembly.Module(wasmTextToBinary(
-    `(module
-      (func (struct.narrow anyref anyref)))`)),
-                   WebAssembly.CompileError,
-                   /unrecognized opcode/);
--- a/js/src/jit-test/tests/wasm/gc/ion-and-baseline.js
+++ b/js/src/jit-test/tests/wasm/gc/ion-and-baseline.js
@@ -1,9 +1,9 @@
-// |jit-test| skip-if: !wasmGcEnabled()
+// |jit-test| skip-if: !wasmReftypesEnabled()
 
 // Attempt to test intercalls from ion to baseline and back.
 //
 // We get into this situation when the modules are compiled with different
 // tiering policies, or one tiers up before the other, or (for now) one opts
 // into gc and is baseline-compiled and the other does not and is ion-compiled.
 // There are lots of variables here.  Generally, a small module will be
 // ion-compiled unless there's reason to baseline-compile it, so we're likely
--- a/js/src/jit-test/tests/wasm/gc/ref.js
+++ b/js/src/jit-test/tests/wasm/gc/ref.js
@@ -1,13 +1,9 @@
-if (!wasmGcEnabled()) {
-    assertErrorMessage(() => wasmEvalText(`(module (func (param (ref 0)) (unreachable)))`),
-                       WebAssembly.CompileError, /reference types not enabled/);
-    quit(0);
-}
+// |jit-test| skip-if: !wasmGcEnabled()
 
 // Parsing and resolving.
 
 var bin = wasmTextToBinary(
     `(module
       (gc_feature_opt_in 2)
       (type $cons (struct
                    (field $car i32)
--- a/js/src/jit-test/tests/wasm/gc/stackmaps1.js
+++ b/js/src/jit-test/tests/wasm/gc/stackmaps1.js
@@ -1,9 +1,9 @@
-// |jit-test| skip-if: !wasmGcEnabled()
+// |jit-test| skip-if: !wasmReftypesEnabled()
 
 // Tests wasm frame tracing.  Only tests for direct and indirect call chains
 // in wasm that lead to JS allocation.  Does not test any timeout or interrupt
 // related aspects.  The structure is
 //
 //   test top level: call fn2
 //   fn2: call fn1
 //   fn1: do 100k times { call-direct fn0; call-indirect fn0; }
--- a/js/src/jit-test/tests/wasm/gc/stackmaps2.js
+++ b/js/src/jit-test/tests/wasm/gc/stackmaps2.js
@@ -1,9 +1,9 @@
-// |jit-test| skip-if: !wasmGcEnabled()
+// |jit-test| skip-if: !wasmReftypesEnabled()
 
 // Tests wasm frame tracing in the presence of interrupt handlers that perform
 // allocation.  The structure is
 //
 //   test top level: call fn2
 //   fn2: call fn1
 //   fn1: repeat { call-direct fn0; call-indirect fn0; }
 //   fn0: a 100-iteration loop that does nothing except waste time
--- a/js/src/jit-test/tests/wasm/gc/stackmaps3.js
+++ b/js/src/jit-test/tests/wasm/gc/stackmaps3.js
@@ -1,9 +1,9 @@
-// |jit-test| skip-if: !wasmGcEnabled()
+// |jit-test| skip-if: !wasmReftypesEnabled()
 
 // Generates a bunch of numbers-on-the-heap, and tries to ensure that they are
 // held live -- at least for a short while -- only by references from the wasm
 // evaluation stack.  Then assembles them in a list and checks that the list
 // is as expected (and we don't segfault).  While all this is running we also
 // have an regular interrupt whose handler does a bunch of allocation, so as
 // to cause as much disruption as possible.
 
new file mode 100644
--- /dev/null
+++ b/js/src/jit-test/tests/wasm/gc/tables-generalized-struct.js
@@ -0,0 +1,50 @@
+// |jit-test| skip-if: !wasmGeneralizedTables() || !wasmGcEnabled()
+
+// table.set in bounds with i32 x anyref - works, no value generated
+// table.set with (ref T) - works
+// table.set with null - works
+// table.set out of bounds - fails
+
+{
+    let ins = wasmEvalText(
+        `(module
+           (gc_feature_opt_in 2)
+           (table (export "t") 10 anyref)
+           (type $dummy (struct (field i32)))
+           (func (export "set_anyref") (param i32) (param anyref)
+             (table.set (get_local 0) (get_local 1)))
+           (func (export "set_null") (param i32)
+             (table.set (get_local 0) (ref.null)))
+           (func (export "set_ref") (param i32) (param anyref)
+             (table.set (get_local 0) (struct.narrow anyref (ref $dummy) (get_local 1))))
+           (func (export "make_struct") (result anyref)
+             (struct.new $dummy (i32.const 37))))`);
+    let x = {};
+    ins.exports.set_anyref(3, x);
+    assertEq(ins.exports.t.get(3), x);
+    ins.exports.set_null(3);
+    assertEq(ins.exports.t.get(3), null);
+    let dummy = ins.exports.make_struct();
+    ins.exports.set_ref(5, dummy);
+    assertEq(ins.exports.t.get(5), dummy);
+
+    assertErrorMessage(() => ins.exports.set_anyref(10, x), RangeError, /index out of bounds/);
+    assertErrorMessage(() => ins.exports.set_anyref(-1, x), RangeError, /index out of bounds/);
+}
+
+// table.grow on table of anyref with non-null ref value
+
+{
+    let ins = wasmEvalText(
+        `(module
+          (gc_feature_opt_in 2)
+          (type $S (struct (field i32) (field f64)))
+          (table (export "t") 2 anyref)
+          (func (export "f") (result i32)
+           (table.grow (i32.const 1) (struct.new $S (i32.const 0) (f64.const 3.14)))))`);
+    assertEq(ins.exports.t.length, 2);
+    assertEq(ins.exports.f(), 2);
+    assertEq(ins.exports.t.length, 3);
+    assertEq(typeof ins.exports.t.get(2), "object");
+}
+
--- a/js/src/jit-test/tests/wasm/gc/tables-generalized.js
+++ b/js/src/jit-test/tests/wasm/gc/tables-generalized.js
@@ -218,42 +218,33 @@ assertErrorMessage(() => new WebAssembly
 assertErrorMessage(() => new WebAssembly.Module(wasmTextToBinary(
     `(module
        (func (export "f") (param i32)
          (drop (table.get (get_local 0)))))`)),
                    WebAssembly.CompileError,
                    /table index out of range for table.get/);
 
 // table.set in bounds with i32 x anyref - works, no value generated
-// table.set with (ref T) - works
 // table.set with null - works
 // table.set out of bounds - fails
 
 {
     let ins = wasmEvalText(
         `(module
            (gc_feature_opt_in 2)
            (table (export "t") 10 anyref)
-           (type $dummy (struct (field i32)))
            (func (export "set_anyref") (param i32) (param anyref)
              (table.set (get_local 0) (get_local 1)))
            (func (export "set_null") (param i32)
-             (table.set (get_local 0) (ref.null)))
-           (func (export "set_ref") (param i32) (param anyref)
-             (table.set (get_local 0) (struct.narrow anyref (ref $dummy) (get_local 1))))
-           (func (export "make_struct") (result anyref)
-             (struct.new $dummy (i32.const 37))))`);
+             (table.set (get_local 0) (ref.null))))`);
     let x = {};
     ins.exports.set_anyref(3, x);
     assertEq(ins.exports.t.get(3), x);
     ins.exports.set_null(3);
     assertEq(ins.exports.t.get(3), null);
-    let dummy = ins.exports.make_struct();
-    ins.exports.set_ref(5, dummy);
-    assertEq(ins.exports.t.get(5), dummy);
 
     assertErrorMessage(() => ins.exports.set_anyref(10, x), RangeError, /index out of bounds/);
     assertErrorMessage(() => ins.exports.set_anyref(-1, x), RangeError, /index out of bounds/);
 }
 
 // table.set with non-i32 index - fails validation
 
 assertErrorMessage(() => new WebAssembly.Module(wasmTextToBinary(
@@ -373,32 +364,16 @@ assertErrorMessage(() => new WebAssembly
 assertErrorMessage(() => new WebAssembly.Module(wasmTextToBinary(
     `(module
        (gc_feature_opt_in 2)
        (func (export "f") (param i32)
         (table.grow (get_local 0) (ref.null))))`)),
                    WebAssembly.CompileError,
                    /table index out of range for table.grow/);
 
-// table.grow on table of anyref with non-null ref value
-
-{
-    let ins = wasmEvalText(
-        `(module
-          (gc_feature_opt_in 2)
-          (type $S (struct (field i32) (field f64)))
-          (table (export "t") 2 anyref)
-          (func (export "f") (result i32)
-           (table.grow (i32.const 1) (struct.new $S (i32.const 0) (f64.const 3.14)))))`);
-    assertEq(ins.exports.t.length, 2);
-    assertEq(ins.exports.f(), 2);
-    assertEq(ins.exports.t.length, 3);
-    assertEq(typeof ins.exports.t.get(2), "object");
-}
-
 // table.size on table of anyref
 
 for (let visibility of ['', '(export "t")', '(import "m" "t")']) {
     let exp = {m:{t: new WebAssembly.Table({element:"anyref",
                                             initial: 10,
                                             maximum: 20})}};
     let ins = wasmEvalText(
         `(module
--- a/js/src/jit/CompileWrappers.cpp
+++ b/js/src/jit/CompileWrappers.cpp
@@ -206,25 +206,25 @@ bool CompileRealm::hasAllocationMetadata
 void CompileRealm::setSingletonsAsValues() {
   realm()->behaviors().setSingletonsAsValues();
 }
 
 JitCompileOptions::JitCompileOptions()
     : cloneSingletons_(false),
       profilerSlowAssertionsEnabled_(false),
       offThreadCompilationAvailable_(false)
-#ifdef ENABLE_WASM_GC
+#ifdef ENABLE_WASM_REFTYPES
       ,
       wasmGcEnabled_(false)
 #endif
 {
 }
 
 JitCompileOptions::JitCompileOptions(JSContext* cx) {
   cloneSingletons_ = cx->realm()->creationOptions().cloneSingletons();
   profilerSlowAssertionsEnabled_ =
       cx->runtime()->geckoProfiler().enabled() &&
       cx->runtime()->geckoProfiler().slowAssertionsEnabled();
   offThreadCompilationAvailable_ = OffThreadCompilationAvailable(cx);
-#ifdef ENABLE_WASM_GC
-  wasmGcEnabled_ = cx->options().wasmGc();
+#ifdef ENABLE_WASM_REFTYPES
+  wasmGcEnabled_ = wasm::HasReftypesSupport(cx);
 #endif
 }
--- a/js/src/jit/CompileWrappers.h
+++ b/js/src/jit/CompileWrappers.h
@@ -125,25 +125,25 @@ class JitCompileOptions {
   bool profilerSlowAssertionsEnabled() const {
     return profilerSlowAssertionsEnabled_;
   }
 
   bool offThreadCompilationAvailable() const {
     return offThreadCompilationAvailable_;
   }
 
-#ifdef ENABLE_WASM_GC
+#ifdef ENABLE_WASM_REFTYPES
   bool wasmGcEnabled() const { return wasmGcEnabled_; }
 #endif
 
  private:
   bool cloneSingletons_;
   bool profilerSlowAssertionsEnabled_;
   bool offThreadCompilationAvailable_;
-#ifdef ENABLE_WASM_GC
+#ifdef ENABLE_WASM_REFTYPES
   bool wasmGcEnabled_;
 #endif
 };
 
 }  // namespace jit
 }  // namespace js
 
 #endif  // jit_CompileWrappers_h
--- a/js/src/js-config.mozbuild
+++ b/js/src/js-config.mozbuild
@@ -1,20 +1,30 @@
 # -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
 # vim: set filetype=python:
 # This Source Code Form is subject to the terms of the Mozilla Public
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
 # Nightly-only features
 if CONFIG['NIGHTLY_BUILD']:
+    # TypedObject
     DEFINES['ENABLE_BINARYDATA'] = True
+    # The evolving bulk-copy proposal - mem.fill, mem.copy,
+    # table.copy, etc
     DEFINES['ENABLE_WASM_BULKMEM_OPS'] = True
+    # Support the evolving reftypes proposal - anyref, funcref, null,
+    # and a few other things
+    DEFINES['ENABLE_WASM_REFTYPES'] = True
+    # Support table of anyref, multiple tables - requires reftypes
+    DEFINES['ENABLE_WASM_GENERALIZED_TABLES'] = True
+    # Support the evolving gc types proposal (struct types, etc)
     DEFINES['ENABLE_WASM_GC'] = True
-    DEFINES['ENABLE_WASM_GENERALIZED_TABLES'] = True
+    # Prevent (ref T) types from being exposed to JS content so that
+    # wasm need do no typechecking at the JS/wasm boundary
     DEFINES['WASM_PRIVATE_REFTYPES'] = True
 
 # Some huge-mapping optimization instead of bounds checks on supported
 # platforms.
 if CONFIG['JS_CODEGEN_X64'] or CONFIG['JS_CODEGEN_ARM64']:
     DEFINES['WASM_HUGE_MEMORY'] = True
 
 # Enables CACHEIR_LOGS to diagnose IC coverage, and
--- a/js/src/jsapi.h
+++ b/js/src/jsapi.h
@@ -393,17 +393,17 @@ class JS_PUBLIC_API ContextOptions {
         asmJS_(true),
         wasm_(true),
         wasmVerbose_(false),
         wasmBaseline_(true),
         wasmIon_(true),
 #ifdef ENABLE_WASM_CRANELIFT
         wasmForceCranelift_(false),
 #endif
-#ifdef ENABLE_WASM_GC
+#ifdef ENABLE_WASM_REFTYPES
         wasmGc_(false),
 #endif
         testWasmAwaitTier2_(false),
         throwOnAsmJSValidationFailure_(false),
         nativeRegExp_(true),
         asyncStack_(true),
         throwOnDebuggeeWouldRun_(true),
         dumpStackOnDebuggeeWouldRun_(false),
@@ -484,17 +484,17 @@ class JS_PUBLIC_API ContextOptions {
 #endif
 
   bool testWasmAwaitTier2() const { return testWasmAwaitTier2_; }
   ContextOptions& setTestWasmAwaitTier2(bool flag) {
     testWasmAwaitTier2_ = flag;
     return *this;
   }
 
-#ifdef ENABLE_WASM_GC
+#ifdef ENABLE_WASM_REFTYPES
   bool wasmGc() const { return wasmGc_; }
   ContextOptions& setWasmGc(bool flag) {
     wasmGc_ = flag;
     return *this;
   }
 #endif
 
   bool throwOnAsmJSValidationFailure() const {
@@ -575,34 +575,34 @@ class JS_PUBLIC_API ContextOptions {
 
   void disableOptionsForSafeMode() {
     setBaseline(false);
     setIon(false);
     setAsmJS(false);
     setWasm(false);
     setWasmBaseline(false);
     setWasmIon(false);
-#ifdef ENABLE_WASM_GC
+#ifdef ENABLE_WASM_REFTYPES
     setWasmGc(false);
 #endif
     setNativeRegExp(false);
   }
 
  private:
   bool baseline_ : 1;
   bool ion_ : 1;
   bool asmJS_ : 1;
   bool wasm_ : 1;
   bool wasmVerbose_ : 1;
   bool wasmBaseline_ : 1;
   bool wasmIon_ : 1;
 #ifdef ENABLE_WASM_CRANELIFT
   bool wasmForceCranelift_ : 1;
 #endif
-#ifdef ENABLE_WASM_GC
+#ifdef ENABLE_WASM_REFTYPES
   bool wasmGc_ : 1;
 #endif
   bool testWasmAwaitTier2_ : 1;
   bool throwOnAsmJSValidationFailure_ : 1;
   bool nativeRegExp_ : 1;
   bool asyncStack_ : 1;
   bool throwOnDebuggeeWouldRun_ : 1;
   bool dumpStackOnDebuggeeWouldRun_ : 1;
--- a/js/src/shell/js.cpp
+++ b/js/src/shell/js.cpp
@@ -489,17 +489,17 @@ static bool enableAsmJS = false;
 static bool enableWasm = false;
 static bool enableNativeRegExp = false;
 static bool enableSharedMemory = SHARED_MEMORY_DEFAULT;
 static bool enableWasmBaseline = false;
 static bool enableWasmIon = false;
 #ifdef ENABLE_WASM_CRANELIFT
 static bool wasmForceCranelift = false;
 #endif
-#ifdef ENABLE_WASM_GC
+#ifdef ENABLE_WASM_REFTYPES
 static bool enableWasmGc = false;
 #endif
 static bool enableWasmVerbose = false;
 static bool enableTestWasmAwaitTier2 = false;
 static bool enableAsyncStacks = false;
 static bool enableStreams = false;
 #ifdef ENABLE_BIGINT
 static bool enableBigInt = false;
@@ -10168,17 +10168,17 @@ static bool SetContextOptions(JSContext*
   enableAsmJS = !op.getBoolOption("no-asmjs");
   enableWasm = !op.getBoolOption("no-wasm");
   enableNativeRegExp = !op.getBoolOption("no-native-regexp");
   enableWasmBaseline = !op.getBoolOption("no-wasm-baseline");
   enableWasmIon = !op.getBoolOption("no-wasm-ion");
 #ifdef ENABLE_WASM_CRANELIFT
   wasmForceCranelift = op.getBoolOption("wasm-force-cranelift");
 #endif
-#ifdef ENABLE_WASM_GC
+#ifdef ENABLE_WASM_REFTYPES
   enableWasmGc = op.getBoolOption("wasm-gc");
 #ifdef ENABLE_WASM_CRANELIFT
   if (enableWasmGc && wasmForceCranelift) {
     fprintf(stderr,
             "Do not combine --wasm-gc and --wasm-force-cranelift, they are "
             "incompatible.\n");
   }
   enableWasmGc = enableWasmGc && !wasmForceCranelift;
@@ -10197,17 +10197,17 @@ static bool SetContextOptions(JSContext*
       .setIon(enableIon)
       .setAsmJS(enableAsmJS)
       .setWasm(enableWasm)
       .setWasmBaseline(enableWasmBaseline)
       .setWasmIon(enableWasmIon)
 #ifdef ENABLE_WASM_CRANELIFT
       .setWasmForceCranelift(wasmForceCranelift)
 #endif
-#ifdef ENABLE_WASM_GC
+#ifdef ENABLE_WASM_REFTYPES
       .setWasmGc(enableWasmGc)
 #endif
       .setWasmVerbose(enableWasmVerbose)
       .setTestWasmAwaitTier2(enableTestWasmAwaitTier2)
       .setNativeRegExp(enableNativeRegExp)
       .setAsyncStack(enableAsyncStacks);
 
   if (op.getBoolOption("no-unboxed-objects")) {
@@ -10524,17 +10524,17 @@ static void SetWorkerContextOptions(JSCo
       .setIon(enableIon)
       .setAsmJS(enableAsmJS)
       .setWasm(enableWasm)
       .setWasmBaseline(enableWasmBaseline)
       .setWasmIon(enableWasmIon)
 #ifdef ENABLE_WASM_CRANELIFT
       .setWasmForceCranelift(wasmForceCranelift)
 #endif
-#ifdef ENABLE_WASM_GC
+#ifdef ENABLE_WASM_REFTYPES
       .setWasmGc(enableWasmGc)
 #endif
       .setWasmVerbose(enableWasmVerbose)
       .setTestWasmAwaitTier2(enableTestWasmAwaitTier2)
       .setNativeRegExp(enableNativeRegExp);
 
   cx->runtime()->setOffthreadIonCompilationEnabled(offthreadCompilation);
   cx->runtime()->profilingScripts =
@@ -10927,17 +10927,17 @@ int main(int argc, char** argv, char** e
       || !op.addBoolOption('\0', "wasm-force-cranelift",
                            "Enable wasm Cranelift compiler")
 #endif
       || !op.addBoolOption('\0', "wasm-verbose",
                            "Enable WebAssembly verbose logging") ||
       !op.addBoolOption('\0', "test-wasm-await-tier2",
                         "Forcibly activate tiering and block "
                         "instantiation on completion of tier2")
-#ifdef ENABLE_WASM_GC
+#ifdef ENABLE_WASM_REFTYPES
       || !op.addBoolOption('\0', "wasm-gc", "Enable wasm GC features")
 #else
       || !op.addBoolOption('\0', "wasm-gc", "No-op")
 #endif
       || !op.addBoolOption('\0', "no-native-regexp",
                            "Disable native regexp compilation") ||
       !op.addBoolOption('\0', "no-unboxed-objects",
                         "Disable creating unboxed plain objects") ||
--- a/js/src/wasm/WasmAST.h
+++ b/js/src/wasm/WasmAST.h
@@ -1287,17 +1287,17 @@ class AstModule : public AstNode {
 
   LifoAlloc& lifo_;
   TypeDefVector types_;
   FuncTypeMap funcTypeMap_;
   ImportVector imports_;
   NameVector funcImportNames_;
   AstTableVector tables_;
   AstMemoryVector memories_;
-#ifdef ENABLE_WASM_GC
+#ifdef ENABLE_WASM_REFTYPES
   uint32_t gcFeatureOptIn_;
 #endif
   ExportVector exports_;
   Maybe<AstStartFunc> startFunc_;
   FuncVector funcs_;
   AstDataSegmentVector dataSegments_;
   AstElemSegmentVector elemSegments_;
   AstGlobalVector globals_;
@@ -1308,32 +1308,32 @@ class AstModule : public AstNode {
   explicit AstModule(LifoAlloc& lifo)
       : lifo_(lifo),
         types_(lifo),
         funcTypeMap_(lifo),
         imports_(lifo),
         funcImportNames_(lifo),
         tables_(lifo),
         memories_(lifo),
-#ifdef ENABLE_WASM_GC
+#ifdef ENABLE_WASM_REFTYPES
         gcFeatureOptIn_(0),
 #endif
         exports_(lifo),
         funcs_(lifo),
         dataSegments_(lifo),
         elemSegments_(lifo),
         globals_(lifo),
         numGlobalImports_(0) {
   }
   bool addMemory(AstName name, const Limits& memory) {
     return memories_.append(AstMemory(memory, false, name));
   }
   bool hasMemory() const { return !!memories_.length(); }
   const AstMemoryVector& memories() const { return memories_; }
-#ifdef ENABLE_WASM_GC
+#ifdef ENABLE_WASM_REFTYPES
   bool addGcFeatureOptIn(uint32_t version) {
     gcFeatureOptIn_ = version;
     return true;
   }
   uint32_t gcFeatureOptIn() const { return gcFeatureOptIn_; }
 #endif
   bool addTable(AstName name, const Limits& table, TableKind tableKind) {
     return tables_.append(AstTable(table, tableKind, false, name));
--- a/js/src/wasm/WasmBaselineCompile.cpp
+++ b/js/src/wasm/WasmBaselineCompile.cpp
@@ -11449,16 +11449,18 @@ bool BaseCompiler::emitBody() {
 
 #ifdef ENABLE_WASM_GC
       case uint16_t(Op::RefEq):
         if (env_.gcTypesEnabled() == HasGcTypes::False) {
           return iter_.unrecognizedOpcode(&op);
         }
         CHECK_NEXT(
             emitComparison(emitCompareRef, ValType::AnyRef, Assembler::Equal));
+#endif
+#ifdef ENABLE_WASM_REFTYPES
       case uint16_t(Op::RefNull):
         if (env_.gcTypesEnabled() == HasGcTypes::False) {
           return iter_.unrecognizedOpcode(&op);
         }
         CHECK_NEXT(emitRefNull());
         break;
       case uint16_t(Op::RefIsNull):
         if (env_.gcTypesEnabled() == HasGcTypes::False) {
--- a/js/src/wasm/WasmCompile.cpp
+++ b/js/src/wasm/WasmCompile.cpp
@@ -69,21 +69,17 @@ uint32_t wasm::ObservedCPUFeatures() {
   return 0;
 #else
 #error "unknown architecture"
 #endif
 }
 
 CompileArgs::CompileArgs(JSContext* cx, ScriptedCaller&& scriptedCaller)
     : scriptedCaller(std::move(scriptedCaller)) {
-#ifdef ENABLE_WASM_GC
-  bool gcEnabled = cx->options().wasmGc();
-#else
-  bool gcEnabled = false;
-#endif
+  bool gcEnabled = HasReftypesSupport(cx);
 
   baselineEnabled = cx->options().wasmBaseline();
   ionEnabled = cx->options().wasmIon();
 #ifdef ENABLE_WASM_CRANELIFT
   forceCranelift = cx->options().wasmForceCranelift();
 #else
   forceCranelift = false;
 #endif
--- a/js/src/wasm/WasmIonCompile.cpp
+++ b/js/src/wasm/WasmIonCompile.cpp
@@ -3645,16 +3645,18 @@ static bool EmitBodyExprs(FunctionCompil
         CHECK(EmitReinterpret(f, ValType::I64, ValType::F64, MIRType::Int64));
       case uint16_t(Op::F32ReinterpretI32):
         CHECK(EmitReinterpret(f, ValType::F32, ValType::I32, MIRType::Float32));
       case uint16_t(Op::F64ReinterpretI64):
         CHECK(EmitReinterpret(f, ValType::F64, ValType::I64, MIRType::Double));
 
 #ifdef ENABLE_WASM_GC
       case uint16_t(Op::RefEq):
+#endif
+#ifdef ENABLE_WASM_REFTYPES
       case uint16_t(Op::RefNull):
       case uint16_t(Op::RefIsNull):
         // Not yet supported
         return f.iter().unrecognizedOpcode(&op);
 #endif
 
       // Sign extensions
       case uint16_t(Op::I32Extend8S):
--- a/js/src/wasm/WasmJS.cpp
+++ b/js/src/wasm/WasmJS.cpp
@@ -52,16 +52,29 @@ using namespace js::jit;
 using namespace js::wasm;
 
 using mozilla::CheckedInt;
 using mozilla::Nothing;
 using mozilla::RangedPtr;
 
 extern mozilla::Atomic<bool> fuzzingSafe;
 
+bool wasm::HasReftypesSupport(JSContext* cx) {
+#ifdef ENABLE_WASM_CRANELIFT
+  if (cx->options().wasmForceCranelift()) {
+    return false;
+  }
+#endif
+#ifdef ENABLE_WASM_REFTYPES
+  return cx->options().wasmGc() && cx->options().wasmBaseline();
+#else
+  return false;
+#endif
+}
+
 bool wasm::HasCompilerSupport(JSContext* cx) {
 #if !MOZ_LITTLE_ENDIAN || defined(JS_CODEGEN_NONE)
   return false;
 #endif
 
   if (gc::SystemPageSize() > wasm::PageSize) {
     return false;
   }
@@ -2042,17 +2055,17 @@ bool WasmTableObject::isNewborn() const 
     return false;
   }
 
   TableKind tableKind;
   if (StringEqualsAscii(elementLinearStr, "anyfunc")) {
     tableKind = TableKind::AnyFunction;
 #ifdef ENABLE_WASM_GENERALIZED_TABLES
   } else if (StringEqualsAscii(elementLinearStr, "anyref")) {
-    if (!cx->options().wasmGc()) {
+    if (!HasReftypesSupport(cx)) {
       JS_ReportErrorNumberUTF8(cx, GetErrorMessage, nullptr,
                                JSMSG_WASM_BAD_ELEMENT);
       return false;
     }
     tableKind = TableKind::AnyRef;
 #endif
   } else {
 #ifdef ENABLE_WASM_GENERALIZED_TABLES
@@ -2454,18 +2467,18 @@ const Class WasmGlobalObject::class_ = {
   } else if (args.length() == 1 && StringEqualsAscii(typeLinearStr, "i64")) {
     // For the time being, i64 is allowed only if there is not an
     // initializing value.
     globalType = ValType::I64;
   } else if (StringEqualsAscii(typeLinearStr, "f32")) {
     globalType = ValType::F32;
   } else if (StringEqualsAscii(typeLinearStr, "f64")) {
     globalType = ValType::F64;
-#ifdef ENABLE_WASM_GC
-  } else if (cx->options().wasmGc() &&
+#ifdef ENABLE_WASM_REFTYPES
+  } else if (HasReftypesSupport(cx) &&
              StringEqualsAscii(typeLinearStr, "anyref")) {
     globalType = ValType::AnyRef;
 #endif
   } else {
     JS_ReportErrorNumberUTF8(cx, GetErrorMessage, nullptr,
                              JSMSG_WASM_BAD_GLOBAL_TYPE);
     return false;
   }
--- a/js/src/wasm/WasmJS.h
+++ b/js/src/wasm/WasmJS.h
@@ -48,16 +48,21 @@ bool HasSupport(JSContext* cx);
 
 // Return whether WebAssembly streaming/caching is supported on this platform.
 // This takes into account prefs and necessary embedding callbacks.
 
 bool HasStreamingSupport(JSContext* cx);
 
 bool HasCachingSupport(JSContext* cx);
 
+// Returns true if WebAssembly as configured by compile-time flags and run-time
+// options can support reference types and stack walking.
+
+bool HasReftypesSupport(JSContext* cx);
+
 // Compiles the given binary wasm module given the ArrayBufferObject
 // and links the module's imports with the given import object.
 
 MOZ_MUST_USE bool Eval(JSContext* cx, Handle<TypedArrayObject*> code,
                        HandleObject importObj,
                        MutableHandleWasmInstanceObject instanceObj);
 
 // For testing cross-process (de)serialization, this pair of functions are
--- a/js/src/wasm/WasmOpIter.cpp
+++ b/js/src/wasm/WasmOpIter.cpp
@@ -18,25 +18,34 @@
 
 #include "wasm/WasmOpIter.h"
 
 using namespace js;
 using namespace js::jit;
 using namespace js::wasm;
 
 #ifdef ENABLE_WASM_GENERALIZED_TABLES
-// Actually we depend only on the reftypes proposal; this guard will change once
-// reftypes and GC are pried apart properly.
-#ifndef ENABLE_WASM_GC
-#error "Generalized tables require the GC feature"
+#ifndef ENABLE_WASM_REFTYPES
+#error "Generalized tables require the reftypes feature"
+#endif
+#endif
+
+#ifdef ENABLE_WASM_GC
+#ifndef ENABLE_WASM_REFTYPES
+#error "GC types require the reftypes feature"
 #endif
 #endif
 
 #ifdef DEBUG
 
+#ifdef ENABLE_WASM_REFTYPES
+#define WASM_REF_OP(code) return code
+#else
+#define WASM_REF_OP(code) break
+#endif
 #ifdef ENABLE_WASM_GC
 #define WASM_GC_OP(code) return code
 #else
 #define WASM_GC_OP(code) break
 #endif
 #ifdef ENABLE_WASM_BULKMEM_OPS
 #define WASM_BULK_OP(code) return code
 #else
@@ -167,17 +176,16 @@ OpKind wasm::Classify(OpBytes op) {
     case Op::F32Gt:
     case Op::F32Ge:
     case Op::F64Eq:
     case Op::F64Ne:
     case Op::F64Lt:
     case Op::F64Le:
     case Op::F64Gt:
     case Op::F64Ge:
-    case Op::RefEq:
       return OpKind::Comparison;
     case Op::I32Eqz:
     case Op::I32WrapI64:
     case Op::I32TruncSF32:
     case Op::I32TruncUF32:
     case Op::I32ReinterpretF32:
     case Op::I32TruncSF64:
     case Op::I32TruncUF64:
@@ -196,17 +204,16 @@ OpKind wasm::Classify(OpBytes op) {
     case Op::F32ConvertUI64:
     case Op::F32DemoteF64:
     case Op::F64ConvertSI32:
     case Op::F64ConvertUI32:
     case Op::F64ConvertSI64:
     case Op::F64ConvertUI64:
     case Op::F64ReinterpretI64:
     case Op::F64PromoteF32:
-    case Op::RefIsNull:
     case Op::I32Extend8S:
     case Op::I32Extend16S:
     case Op::I64Extend8S:
     case Op::I64Extend16S:
     case Op::I64Extend32S:
       return OpKind::Conversion;
     case Op::I32Load8S:
     case Op::I32Load8U:
@@ -259,17 +266,21 @@ OpKind wasm::Classify(OpBytes op) {
       return OpKind::Else;
     case Op::End:
       return OpKind::End;
     case Op::CurrentMemory:
       return OpKind::CurrentMemory;
     case Op::GrowMemory:
       return OpKind::GrowMemory;
     case Op::RefNull:
-      WASM_GC_OP(OpKind::RefNull);
+      WASM_REF_OP(OpKind::RefNull);
+    case Op::RefIsNull:
+      WASM_REF_OP(OpKind::Conversion);
+    case Op::RefEq:
+      WASM_GC_OP(OpKind::Comparison);
     case Op::MiscPrefix: {
       switch (MiscOp(op.b1)) {
         case MiscOp::Limit:
           // Reject Limit for MiscPrefix encoding
           break;
         case MiscOp::I32TruncSSatF32:
         case MiscOp::I32TruncUSatF32:
         case MiscOp::I32TruncSSatF64:
--- a/js/src/wasm/WasmStubs.cpp
+++ b/js/src/wasm/WasmStubs.cpp
@@ -217,17 +217,17 @@ static const LiveRegisterSet NonVolatile
 #if defined(JS_CODEGEN_NONE)
 static const unsigned NonVolatileRegsPushSize = 0;
 #else
 static const unsigned NonVolatileRegsPushSize =
     NonVolatileRegs.gprs().size() * sizeof(intptr_t) +
     NonVolatileRegs.fpus().getPushSizeInBytes();
 #endif
 
-#ifdef ENABLE_WASM_GC
+#ifdef ENABLE_WASM_REFTYPES
 static const unsigned NumExtraPushed = 2;  // tls and argv
 #else
 static const unsigned NumExtraPushed = 1;  // argv
 #endif
 
 #ifdef JS_CODEGEN_ARM64
 static const unsigned WasmPushSize = 16;
 #else
@@ -341,17 +341,17 @@ static bool GenerateInterpEntry(MacroAss
   if (arg.kind() == ABIArg::GPR) {
     masm.movePtr(arg.gpr(), WasmTlsReg);
   } else {
     masm.loadPtr(
         Address(masm.getStackPointer(), argBase + arg.offsetFromArgBase()),
         WasmTlsReg);
   }
 
-#ifdef ENABLE_WASM_GC
+#ifdef ENABLE_WASM_REFTYPES
   WasmPush(masm, WasmTlsReg);
 #endif
 
   // Save 'argv' on the stack so that we can recover it after the call.
   WasmPush(masm, argv);
 
   // Since we're about to dynamically align the stack, reset the frame depth
   // so we can still assert static stack depth balancing.
@@ -398,17 +398,17 @@ static bool GenerateInterpEntry(MacroAss
   masm.PopStackPtr();
 #endif
   MOZ_ASSERT(masm.framePushed() == 0);
   masm.setFramePushed(FramePushedBeforeAlign);
 
   // Recover the 'argv' pointer which was saved before aligning the stack.
   WasmPop(masm, argv);
 
-#ifdef ENABLE_WASM_GC
+#ifdef ENABLE_WASM_REFTYPES
   WasmPop(masm, WasmTlsReg);
 #endif
 
   // Store the return value in argv[0].
   StoreABIReturn(masm, fe, argv);
 
   // After the ReturnReg is stored into argv[0] but before fp is clobbered by
   // the PopRegsInMask(NonVolatileRegs) below, set the return value based on
--- a/js/src/wasm/WasmTextToBinary.cpp
+++ b/js/src/wasm/WasmTextToBinary.cpp
@@ -83,17 +83,17 @@ class WasmToken {
     EndOfFile,
     Equal,
     Error,
     Export,
     ExtraConversionOpcode,
     Field,
     Float,
     Func,
-#ifdef ENABLE_WASM_GC
+#ifdef ENABLE_WASM_REFTYPES
     GcFeatureOptIn,
 #endif
     GetGlobal,
     GetLocal,
     Global,
     GrowMemory,
     If,
     Import,
@@ -360,17 +360,17 @@ class WasmToken {
       case EndOfFile:
       case Equal:
       case End:
       case Error:
       case Export:
       case Field:
       case Float:
       case Func:
-#ifdef ENABLE_WASM_GC
+#ifdef ENABLE_WASM_REFTYPES
       case GcFeatureOptIn:
 #endif
       case Global:
       case Mutable:
       case Import:
       case Index:
       case Memory:
       case NegativeZero:
@@ -1303,17 +1303,17 @@ WasmToken WasmTokenStream::next() {
             }
             break;
         }
         break;
       }
       break;
 
     case 'g':
-#ifdef ENABLE_WASM_GC
+#ifdef ENABLE_WASM_REFTYPES
       if (consume(u"gc_feature_opt_in")) {
         return WasmToken(WasmToken::GcFeatureOptIn, begin, cur_);
       }
 #endif
       if (consume(u"get_global")) {
         return WasmToken(WasmToken::GetGlobal, begin, cur_);
       }
       if (consume(u"get_local")) {
@@ -4527,17 +4527,17 @@ static bool ParseMemory(WasmParseContext
   Limits memory;
   if (!ParseLimits(c, &memory, Shareable::True)) {
     return false;
   }
 
   return module->addMemory(name, memory);
 }
 
-#ifdef ENABLE_WASM_GC
+#ifdef ENABLE_WASM_REFTYPES
 // Custom section for experimental work.  The size of this section should always
 // be 1 byte, and that byte is a nonzero varint7 carrying the version number
 // being opted into.
 static bool ParseGcFeatureOptIn(WasmParseContext& c, AstModule* module) {
   WasmToken token;
   if (!c.ts.getIf(WasmToken::Index, &token)) {
     c.ts.generateError(token, "GC feature version number required", c.error);
     return false;
@@ -5071,17 +5071,17 @@ static AstModule* ParseModule(const char
         break;
       }
       case WasmToken::Memory: {
         if (!ParseMemory(c, module)) {
           return nullptr;
         }
         break;
       }
-#ifdef ENABLE_WASM_GC
+#ifdef ENABLE_WASM_REFTYPES
       case WasmToken::GcFeatureOptIn: {
         if (!ParseGcFeatureOptIn(c, module)) {
           return nullptr;
         }
         break;
       }
 #endif
       case WasmToken::Global: {
@@ -6555,17 +6555,17 @@ static bool EncodeExpr(Encoder& e, AstEx
 #endif
   }
   MOZ_CRASH("Bad expr kind");
 }
 
 /*****************************************************************************/
 // wasm AST binary serialization
 
-#ifdef ENABLE_WASM_GC
+#ifdef ENABLE_WASM_REFTYPES
 static bool EncodeGcFeatureOptInSection(Encoder& e, AstModule& module) {
   uint32_t optInVersion = module.gcFeatureOptIn();
   if (!optInVersion) {
     return true;
   }
 
   size_t offset;
   if (!e.startSection(SectionId::GcFeatureOptIn, &offset)) {
@@ -7153,17 +7153,17 @@ static bool EncodeModule(AstModule& modu
   if (!e.writeFixedU32(MagicNumber)) {
     return false;
   }
 
   if (!e.writeFixedU32(EncodingVersion)) {
     return false;
   }
 
-#ifdef ENABLE_WASM_GC
+#ifdef ENABLE_WASM_REFTYPES
   if (!EncodeGcFeatureOptInSection(e, module)) {
     return false;
   }
 #endif
 
   if (!EncodeTypeSection(e, module)) {
     return false;
   }
--- a/js/src/wasm/WasmValidate.cpp
+++ b/js/src/wasm/WasmValidate.cpp
@@ -976,16 +976,18 @@ static bool DecodeFunctionBodyExprs(cons
 #ifdef ENABLE_WASM_GC
       case uint16_t(Op::RefEq): {
         if (env.gcTypesEnabled() == HasGcTypes::False) {
           return iter.unrecognizedOpcode(&op);
         }
         CHECK(iter.readComparison(ValType::AnyRef, &nothing, &nothing));
         break;
       }
+#endif
+#ifdef ENABLE_WASM_REFTYPES
       case uint16_t(Op::RefNull): {
         if (env.gcTypesEnabled() == HasGcTypes::False) {
           return iter.unrecognizedOpcode(&op);
         }
         CHECK(iter.readRefNull());
         break;
       }
       case uint16_t(Op::RefIsNull): {
@@ -1409,17 +1411,17 @@ static bool DecodeStructType(Decoder& d,
   env->types[typeIndex] =
       TypeDef(StructType(std::move(fields), env->numStructTypes, isInline));
   (*typeState)[typeIndex] = TypeState::Struct;
   env->numStructTypes++;
 
   return true;
 }
 
-#ifdef ENABLE_WASM_GC
+#ifdef ENABLE_WASM_REFTYPES
 static bool DecodeGCFeatureOptInSection(Decoder& d, ModuleEnvironment* env) {
   MaybeSectionRange range;
   if (!d.startSection(SectionId::GcFeatureOptIn, env, &range, "type")) {
     return false;
   }
   if (!range) {
     return true;
   }
@@ -2411,17 +2413,17 @@ bool wasm::StartsCodeSection(const uint8
   return false;
 }
 
 bool wasm::DecodeModuleEnvironment(Decoder& d, ModuleEnvironment* env) {
   if (!DecodePreamble(d)) {
     return false;
   }
 
-#ifdef ENABLE_WASM_GC
+#ifdef ENABLE_WASM_REFTYPES
   if (!DecodeGCFeatureOptInSection(d, env)) {
     return false;
   }
   HasGcTypes gcFeatureOptIn = env->gcFeatureOptIn;
 #else
   HasGcTypes gcFeatureOptIn = HasGcTypes::False;
 #endif
 
@@ -2785,19 +2787,19 @@ bool wasm::DecodeModuleTail(Decoder& d, 
 }
 
 // Validate algorithm.
 
 bool wasm::Validate(JSContext* cx, const ShareableBytes& bytecode,
                     UniqueChars* error) {
   Decoder d(bytecode.bytes, 0, error);
 
-#ifdef ENABLE_WASM_GC
+#ifdef ENABLE_WASM_REFTYPES
   HasGcTypes gcTypesConfigured =
-      cx->options().wasmGc() ? HasGcTypes::True : HasGcTypes::False;
+      HasReftypesSupport(cx) ? HasGcTypes::True : HasGcTypes::False;
 #else
   HasGcTypes gcTypesConfigured = HasGcTypes::False;
 #endif
 
   CompilerEnvironment compilerEnv(CompileMode::Once, Tier::Optimized,
                                   OptimizedBackend::Ion, DebugEnabled::False,
                                   gcTypesConfigured);
   ModuleEnvironment env(
--- a/js/src/wasm/WasmValidate.h
+++ b/js/src/wasm/WasmValidate.h
@@ -139,17 +139,17 @@ struct ModuleEnvironment {
   //
   // For now, the value is used to control whether we emit code to suppress GC
   // while wasm activations are on the stack.
   const HasGcTypes gcTypesConfigured;
   CompilerEnvironment* const compilerEnv;
 
   // Module fields decoded from the module environment (or initialized while
   // validating an asm.js module) and immutable during compilation:
-#ifdef ENABLE_WASM_GC
+#ifdef ENABLE_WASM_REFTYPES
   // `gcFeatureOptIn` reflects the presence in a module of a GcFeatureOptIn
   // section.  This variable will be removed eventually, allowing it to be
   // replaced everywhere by the value HasGcTypes::True.
   //
   // The flag is used in the value of gcTypesEnabled(), which controls whether
   // ref types and struct types and associated instructions are accepted
   // during validation.
   HasGcTypes gcFeatureOptIn;
@@ -180,17 +180,17 @@ struct ModuleEnvironment {
   explicit ModuleEnvironment(HasGcTypes gcTypesConfigured,
                              CompilerEnvironment* compilerEnv,
                              Shareable sharedMemoryEnabled,
                              ModuleKind kind = ModuleKind::Wasm)
       : kind(kind),
         sharedMemoryEnabled(sharedMemoryEnabled),
         gcTypesConfigured(gcTypesConfigured),
         compilerEnv(compilerEnv),
-#ifdef ENABLE_WASM_GC
+#ifdef ENABLE_WASM_REFTYPES
         gcFeatureOptIn(HasGcTypes::False),
 #endif
         memoryUsage(MemoryUsage::None),
         minMemoryLength(0),
         numStructTypes(0) {
   }
 
   Tier tier() const { return compilerEnv->tier(); }
--- a/js/xpconnect/src/XPCJSContext.cpp
+++ b/js/xpconnect/src/XPCJSContext.cpp
@@ -769,17 +769,17 @@ static void ReloadPrefsCallback(const ch
   bool useWasm = Preferences::GetBool(JS_OPTIONS_DOT_STR "wasm");
   bool useWasmIon = Preferences::GetBool(JS_OPTIONS_DOT_STR "wasm_ionjit");
   bool useWasmBaseline =
       Preferences::GetBool(JS_OPTIONS_DOT_STR "wasm_baselinejit");
 #ifdef ENABLE_WASM_CRANELIFT
   bool useWasmCranelift =
       Preferences::GetBool(JS_OPTIONS_DOT_STR "wasm_cranelift");
 #endif
-#ifdef ENABLE_WASM_GC
+#ifdef ENABLE_WASM_REFTYPES
   bool useWasmGc = Preferences::GetBool(JS_OPTIONS_DOT_STR "wasm_gc");
 #endif
   bool useWasmVerbose = Preferences::GetBool(JS_OPTIONS_DOT_STR "wasm_verbose");
   bool throwOnAsmJSValidationFailure = Preferences::GetBool(
       JS_OPTIONS_DOT_STR "throw_on_asmjs_validation_failure");
   bool useNativeRegExp =
       Preferences::GetBool(JS_OPTIONS_DOT_STR "native_regexp");
 
@@ -862,17 +862,17 @@ static void ReloadPrefsCallback(const ch
       .setIon(useIon)
       .setAsmJS(useAsmJS)
       .setWasm(useWasm)
       .setWasmIon(useWasmIon)
       .setWasmBaseline(useWasmBaseline)
 #ifdef ENABLE_WASM_CRANELIFT
       .setWasmForceCranelift(useWasmCranelift)
 #endif
-#ifdef ENABLE_WASM_GC
+#ifdef ENABLE_WASM_REFTYPES
       .setWasmGc(useWasmGc)
 #endif
       .setWasmVerbose(useWasmVerbose)
       .setThrowOnAsmJSValidationFailure(throwOnAsmJSValidationFailure)
       .setNativeRegExp(useNativeRegExp)
       .setAsyncStack(useAsyncStack)
       .setThrowOnDebuggeeWouldRun(throwOnDebuggeeWouldRun)
       .setDumpStackOnDebuggeeWouldRun(dumpStackOnDebuggeeWouldRun)
--- a/js/xpconnect/src/moz.build
+++ b/js/xpconnect/src/moz.build
@@ -59,9 +59,10 @@ LOCAL_INCLUDES += [
     '/layout/base',
     '/layout/style',
 ]
 
 if CONFIG['CC_TYPE'] in ('clang', 'gcc'):
     CXXFLAGS += ['-Wno-shadow', '-Werror=format']
 
 if CONFIG['NIGHTLY_BUILD']:
+    DEFINES['ENABLE_WASM_REFTYPES'] = True
     DEFINES['ENABLE_WASM_GC'] = True
--- a/layout/base/crashtests/crashtests.list
+++ b/layout/base/crashtests/crashtests.list
@@ -313,17 +313,17 @@ load 497519-2.xhtml
 load 497519-3.xhtml
 load 497519-4.xhtml
 load 499741-1.xhtml
 load 499841-1.xhtml
 load 499858-1.xhtml
 load 500467-1.html
 load 501878-1.html
 load 503936-1.html
-load 507119.html
+skip-if(Android&&AndroidVersion<21) load 507119.html
 load 522374-1.html
 load 522374-2.html
 load 526378-1.xul
 load 534367-1.xhtml
 load 534368-1.xhtml
 load 534768-1.html
 load 534768-2.html
 load 535721-1.xhtml
--- a/layout/generic/nsIFrame.h
+++ b/layout/generic/nsIFrame.h
@@ -8,17 +8,42 @@
 
 #ifndef nsIFrame_h___
 #define nsIFrame_h___
 
 #ifndef MOZILLA_INTERNAL_API
 #error This header/class should only be used within Mozilla code. It should not be used by extensions.
 #endif
 
-#define MAX_REFLOW_DEPTH 200
+#if (defined(XP_WIN) && !defined(HAVE_64BIT_BUILD)) || defined(ANDROID)
+// Blink's magic depth limit from its HTML parser (513) plus as much as fits in the
+// default run-time stack on armv7 Android on Dalvik when using display: block minus
+// a bit just to be sure. The Dalvik default stack crashes at 588. ART can do a few
+// frames more. Using the same number for 32-bit Windows for consistency. Over there,
+// Blink's magic depth of 513 doesn't fit in the default stack of 1 MB, but this magic
+// depth fits when the default is grown by mere 192 KB (tested in 64 KB increments).
+//
+// 32-bit Windows has a different limit compared to 64-bit desktop, because the
+// default stack size affects all threads and consumes address space. Fixing that
+// is bug 1257522.
+//
+// 32-bit Android on ARM already happens to have defaults that are close enough to
+// what makes sense as a temporary measure on Windows, so adjusting the Android
+// stack can be a follow-up. The stack on 64-bit ARM needs adjusting in any case
+// before 64-bit ARM can become tier-1. See bug 1400811.
+//
+// Ideally, we'd get rid of this smaller limit and make 32-bit Windows and Android
+// capable of working with the Linux/Mac/Win64 number below.
+#define MAX_REFLOW_DEPTH 585
+#else
+// Blink's magic depth limit from its HTML parser times two. Also just about fits
+// within the system default runtime stack limit of 8 MB on 64-bit Mac and Linux with
+// display: table-cell.
+#define MAX_REFLOW_DEPTH 1026
+#endif
 
 /* nsIFrame is in the process of being deCOMtaminated, i.e., this file is
    eventually going to be eliminated, and all callers will use nsFrame instead.
    At the moment we're midway through this process, so you will see inlined
    functions and member variables in this file.  -dwh */
 
 #include <algorithm>
 #include <stdio.h>
new file mode 100644
--- /dev/null
+++ b/layout/reftests/bugs/256180-1-ref.html
@@ -0,0 +1,11 @@
+<!DOCTYPE html>
+<html>
+<head>
+    <meta charset="utf-8">
+    <title>1026-deep display: table-cell</title>
+</head>
+<body>
+<h1>1026-element-deep display: table-cell</h1>
+<p>Actual depth (including text leaves): 1027
+</body>
+</html>
new file mode 100644
--- /dev/null
+++ b/layout/reftests/bugs/256180-1.html
@@ -0,0 +1,68 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>1026-element-deep display: table-cell</title>
+<script>
+// Any copyright is dedicated to the Public Domain.
+// http://creativecommons.org/publicdomain/zero/1.0/
+
+function count() {
+    var depth = 0;
+    var deepest = 0;
+    var current = document;
+    var next = null;
+    outer: for (;;) {
+        if ((next = current.firstChild)) {
+            depth++;
+            if (depth > deepest) {
+                deepest = depth;
+            }
+            current = next;
+            continue;
+        }
+        for (;;) {
+            if ((next = current.nextSibling)) {
+                current = next;
+                break;
+            }
+            current = current.parentNode;
+            depth--;
+            if (current == document) {
+                break outer;
+            }
+        }
+    }
+
+    var h1 = document.getElementsByTagName("h1")[0];
+    var p = document.createElement("p");
+    var t = document.createTextNode("Actual depth (including text leaves): " + deepest);
+    p.appendChild(t);
+    h1.parentNode.insertBefore(p, h1.nextSibling);
+}
+
+function deep() {
+    var t = document.createTextNode("PASS");
+    var div = document.createElement("div");
+    div.appendChild(t);
+    for (var i = 0; i < 1023; i++) {
+        var another = document.createElement("div");
+        another.appendChild(div);
+        div = another;
+    }
+    document.body.appendChild(div);
+    count();
+}
+
+window.addEventListener('DOMContentLoaded', deep, false);
+</script>
+<style>
+    div {
+        display: table-cell;
+    }
+</style>
+</head>
+<body>
+<h1>1026-element-deep display: table-cell</h1>
+</body>
+</html>
new file mode 100644
--- /dev/null
+++ b/layout/reftests/bugs/256180-2-ref.html
@@ -0,0 +1,11 @@
+<!DOCTYPE html>
+<html>
+<head>
+    <meta charset="utf-8">
+    <title>585-deep display: table-cell</title>
+</head>
+<body>
+<h1>585-element-deep display: table-cell</h1>
+<p>Actual depth (including text leaves): 586
+</body>
+</html>
new file mode 100644
--- /dev/null
+++ b/layout/reftests/bugs/256180-2.html
@@ -0,0 +1,68 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>585-element-deep display: table-cell</title>
+<script>
+// Any copyright is dedicated to the Public Domain.
+// http://creativecommons.org/publicdomain/zero/1.0/
+
+function count() {
+    var depth = 0;
+    var deepest = 0;
+    var current = document;
+    var next = null;
+    outer: for (;;) {
+        if ((next = current.firstChild)) {
+            depth++;
+            if (depth > deepest) {
+                deepest = depth;
+            }
+            current = next;
+            continue;
+        }
+        for (;;) {
+            if ((next = current.nextSibling)) {
+                current = next;
+                break;
+            }
+            current = current.parentNode;
+            depth--;
+            if (current == document) {
+                break outer;
+            }
+        }
+    }
+
+    var h1 = document.getElementsByTagName("h1")[0];
+    var p = document.createElement("p");
+    var t = document.createTextNode("Actual depth (including text leaves): " + deepest);
+    p.appendChild(t);
+    h1.parentNode.insertBefore(p, h1.nextSibling);
+}
+
+function deep() {
+    var t = document.createTextNode("PASS");
+    var div = document.createElement("div");
+    div.appendChild(t);
+    for (var i = 0; i < 582; i++) {
+        var another = document.createElement("div");
+        another.appendChild(div);
+        div = another;
+    }
+    document.body.appendChild(div);
+    count();
+}
+
+window.addEventListener('DOMContentLoaded', deep, false);
+</script>
+<style>
+    div {
+        display: table-cell;
+    }
+</style>
+</head>
+<body>
+<h1>585-element-deep display: table-cell</h1>
+</body>
+</html>
new file mode 100644
--- /dev/null
+++ b/layout/reftests/bugs/256180-3-ref.html
@@ -0,0 +1,12 @@
+<!DOCTYPE html>
+<html>
+<head>
+    <meta charset="utf-8">
+    <title>1026-deep display: block</title>
+</head>
+<body>
+<h1>1026-element-deep display: block</h1>
+<p>Actual depth (including text leaves): 1027
+<div>PASS</div>
+</body>
+</html>
new file mode 100644
--- /dev/null
+++ b/layout/reftests/bugs/256180-3.html
@@ -0,0 +1,63 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>1026-element-deep display: block</title>
+<script>
+// Any copyright is dedicated to the Public Domain.
+// http://creativecommons.org/publicdomain/zero/1.0/
+
+function count() {
+    var depth = 0;
+    var deepest = 0;
+    var current = document;
+    var next = null;
+    outer: for (;;) {
+        if ((next = current.firstChild)) {
+            depth++;
+            if (depth > deepest) {
+                deepest = depth;
+            }
+            current = next;
+            continue;
+        }
+        for (;;) {
+            if ((next = current.nextSibling)) {
+                current = next;
+                break;
+            }
+            current = current.parentNode;
+            depth--;
+            if (current == document) {
+                break outer;
+            }
+        }
+    }
+
+    var h1 = document.getElementsByTagName("h1")[0];
+    var p = document.createElement("p");
+    var t = document.createTextNode("Actual depth (including text leaves): " + deepest);
+    p.appendChild(t);
+    h1.parentNode.insertBefore(p, h1.nextSibling);
+}
+
+function deep() {
+    var t = document.createTextNode("PASS");
+    var div = document.createElement("div");
+    div.appendChild(t);
+    for (var i = 0; i < 1023; i++) {
+        var another = document.createElement("div");
+        another.appendChild(div);
+        div = another;
+    }
+    document.body.appendChild(div);
+    count();
+}
+
+window.addEventListener('DOMContentLoaded', deep, false);
+</script>
+</head>
+<body>
+<h1>1026-element-deep display: block</h1>
+</body>
+</html>
new file mode 100644
--- /dev/null
+++ b/layout/reftests/bugs/256180-4-ref.html
@@ -0,0 +1,12 @@
+<!DOCTYPE html>
+<html>
+<head>
+    <meta charset="utf-8">
+    <title>585-deep display: block</title>
+</head>
+<body>
+<h1>585-element-deep display: block</h1>
+<p>Actual depth (including text leaves): 586
+<div>PASS</div>
+</body>
+</html>
new file mode 100644
--- /dev/null
+++ b/layout/reftests/bugs/256180-4.html
@@ -0,0 +1,63 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>585-element-deep display: block</title>
+<script>
+// Any copyright is dedicated to the Public Domain.
+// http://creativecommons.org/publicdomain/zero/1.0/
+
+function count() {
+    var depth = 0;
+    var deepest = 0;
+    var current = document;
+    var next = null;
+    outer: for (;;) {
+        if ((next = current.firstChild)) {
+            depth++;
+            if (depth > deepest) {
+                deepest = depth;
+            }
+            current = next;
+            continue;
+        }
+        for (;;) {
+            if ((next = current.nextSibling)) {
+                current = next;
+                break;
+            }
+            current = current.parentNode;
+            depth--;
+            if (current == document) {
+                break outer;
+            }
+        }
+    }
+
+    var h1 = document.getElementsByTagName("h1")[0];
+    var p = document.createElement("p");
+    var t = document.createTextNode("Actual depth (including text leaves): " + deepest);
+    p.appendChild(t);
+    h1.parentNode.insertBefore(p, h1.nextSibling);
+}
+
+function deep() {
+    var t = document.createTextNode("PASS");
+    var div = document.createElement("div");
+    div.appendChild(t);
+    for (var i = 0; i < 582; i++) {
+        var another = document.createElement("div");
+        another.appendChild(div);
+        div = another;
+    }
+    document.body.appendChild(div);
+    count();
+}
+
+window.addEventListener('DOMContentLoaded', deep, false);
+</script>
+</head>
+<body>
+<h1>585-element-deep display: block</h1>
+</body>
+</html>
new file mode 100644
--- /dev/null
+++ b/layout/reftests/bugs/256180-5-ref.html
@@ -0,0 +1,2004 @@
+<!DOCTYPE html><meta charset=utf-8><title>&lt;font&gt; with alternating attributes and a character between each tag 4000</title>
+<h1>&lt;font&gt; with alternating attributes and a character between each tag 4000</h1>
+<p>Actual depth (including text leaves): 514</p>
+z<font color="#FF0000">x</font>
+<font color="#000000">z</font><font color="#FF0000">x</font>
+<font color="#000000">z</font><font color="#FF0000">x</font>
+<font color="#000000">z</font><font color="#FF0000">x</font>
+<font color="#000000">z</font><font color="#FF0000">x</font>
+<font color="#000000">z</font><font color="#FF0000">x</font>
+<font color="#000000">z</font><font color="#FF0000">x</font>
+<font color="#000000">z</font><font color="#FF0000">x</font>
+<font color="#000000">z</font><font color="#FF0000">x</font>
+<font color="#000000">z</font><font color="#FF0000">x</font>
+<font color="#000000">z</font><font color="#FF0000">x</font>
+<font color="#000000">z</font><font color="#FF0000">x</font>
+<font color="#000000">z</font><font color="#FF0000">x</font>
+<font color="#000000">z</font><font color="#FF0000">x</font>
+<font color="#000000">z</font><font color="#FF0000">x</font>
+<font color="#000000">z</font><font color="#FF0000">x</font>
+<font color="#000000">z</font><font color="#FF0000">x</font>
+<font color="#000000">z</font><font color="#FF0000">x</font>
+<font color="#000000">z</font><font color="#FF0000">x</font>
+<font color="#000000">z</font><font color="#FF0000">x</font>
+<font color="#000000">z</font><font color="#FF0000">x</font>
+<font color="#000000">z</font><font color="#FF0000">x</font>
+<font color="#000000">z</font><font color="#FF0000">x</font>
+<font color="#000000">z</font><font color="#FF0000">x</font>
+<font color="#000000">z</font><font color="#FF0000">x</font>
+<font color="#000000">z</font><font color="#FF0000">x</font>
+<font color="#000000">z</font><font color="#FF0000">x</font>
+<font color="#000000">z</font><font color="#FF0000">x</font>
+<font color="#000000">z</font><font color="#FF0000">x</font>
+<font color="#000000">z</font><font color="#FF0000">x</font>
+<font color="#000000">z</font><font color="#FF0000">x</font>
+<font color="#000000">z</font><font color="#FF0000">x</font>
+<font color="#000000">z</font><font color="#FF0000">x</font>
+<font color="#000000">z</font><font color="#FF0000">x</font>
+<font color="#000000">z</font><font color="#FF0000">x</font>
+<font color="#000000">z</font><font color="#FF0000">x</font>
+<font color="#000000">z</font><font color="#FF0000">x</font>
+<font color="#000000">z</font><font color="#FF0000">x</font>
+<font color="#000000">z</font><font color="#FF0000">x</font>
+<font color="#000000">z</font><font color="#FF0000">x</font>
+<font color="#000000">z</font><font color="#FF0000">x</font>
+<font color="#000000">z</font><font color="#FF0000">x</font>
+<font color="#000000">z</font><font color="#FF0000">x</font>
+<font color="#000000">z</font><font color="#FF0000">x</font>
+<font color="#000000">z</font><font color="#FF0000">x</font>
+<font color="#000000">z</font><font color="#FF0000">x</font>
+<font color="#000000">z</font><font color="#FF0000">x</font>
+<font color="#000000">z</font><font color="#FF0000">x</font>
+<font color="#000000">z</font><font color="#FF0000">x</font>
+<font color="#000000">z</font><font color="#FF0000">x</font>
+<font color="#000000">z</font><font color="#FF0000">x</font>
+<font color="#000000">z</font><font color="#FF0000">x</font>
+<font color="#000000">z</font><font color="#FF0000">x</font>
+<font color="#000000">z</font><font color="#FF0000">x</font>
+<font color="#000000">z</font><font color="#FF0000">x</font>
+<font color="#000000">z</font><font color="#FF0000">x</font>
+<font color="#000000">z</font><font color="#FF0000">x</font>
+<font color="#000000">z</font><font color="#FF0000">x</font>
+<font color="#000000">z</font><font color="#FF0000">x</font>
+<font color="#000000">z</font><font color="#FF0000">x</font>
+<font color="#000000">z</font><font color="#FF0000">x</font>
+<font color="#000000">z</font><font color="#FF0000">x</font>
+<font color="#000000">z</font><font color="#FF0000">x</font>
+<font color="#000000">z</font><font color="#FF0000">x</font>
+<font color="#000000">z</font><font color="#FF0000">x</font>
+<font color="#000000">z</font><font color="#FF0000">x</font>
+<font color="#000000">z</font><font color="#FF0000">x</font>
+<font color="#000000">z</font><font color="#FF0000">x</font>
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