--- a/browser/base/content/browser-safebrowsing.js
+++ b/browser/base/content/browser-safebrowsing.js
@@ -18,31 +18,26 @@ var gSafeBrowsing = {
       docURI && docURI.spec.startsWith("about:blocked?e=deceptiveBlocked");
 
     // Show/hide the appropriate menu item.
     document.getElementById("menu_HelpPopup_reportPhishingtoolmenu")
             .hidden = isPhishingPage;
     document.getElementById("menu_HelpPopup_reportPhishingErrortoolmenu")
             .hidden = !isPhishingPage;
 
-    var broadcasterId = isPhishingPage
-                        ? "reportPhishingErrorBroadcaster"
-                        : "reportPhishingBroadcaster";
-
-    var broadcaster = document.getElementById(broadcasterId);
-    if (!broadcaster)
-      return;
-
     // Now look at the currentURI to learn which page we were trying
     // to browse to.
-    let uri = gBrowser.currentURI;
-    if (uri && (uri.schemeIs("http") || uri.schemeIs("https")))
-      broadcaster.removeAttribute("disabled");
-    else
-      broadcaster.setAttribute("disabled", true);
+    const uri = gBrowser.currentURI;
+    const isReportablePage = uri && (uri.schemeIs("http") || uri.schemeIs("https"));
+
+    const disabledByPolicy = !Services.policies.isAllowed("feedbackCommands");
+    document.getElementById("reportPhishingBroadcaster")
+            .disabled = disabledByPolicy || isPhishingPage || !isReportablePage;
+    document.getElementById("reportPhishingErrorBroadcaster")
+            .disabled = disabledByPolicy || !isPhishingPage || !isReportablePage;
   },
 
   /**
    * Used to report a phishing page or a false positive
    *
    * @param name
    *        String One of "PhishMistake", "MalwareMistake", or "Phish"
    * @param info

--- a/browser/base/content/utilityOverlay.js
+++ b/browser/base/content/utilityOverlay.js
@@ -826,16 +826,22 @@ function openFeedbackPage() {
 
 function openTourPage() {
   let scope = {};
   ChromeUtils.import("resource:///modules/UITour.jsm", scope);
   openUILinkIn(scope.UITour.url, "tab");
 }
 
 function buildHelpMenu() {
+  document.getElementById("feedbackPage")
+          .disabled = !Services.policies.isAllowed("feedbackCommands");
+
+  document.getElementById("helpSafeMode")
+          .disabled = !Services.policies.isAllowed("safeMode");
+
   // Enable/disable the "Report Web Forgery" menu item.
   if (typeof gSafeBrowsing != "undefined") {
     gSafeBrowsing.setReportPhishingMenu();
   }
 }
 
 function isElementVisible(aElement) {
   if (!aElement)

--- a/browser/components/enterprisepolicies/Policies.jsm
+++ b/browser/components/enterprisepolicies/Policies.jsm
@@ -130,30 +130,46 @@ var Policies = {
   "DisableAppUpdate": {
     onBeforeAddons(manager, param) {
       if (param) {
         manager.disallowFeature("appUpdate");
       }
     }
   },
 
+  "DisableBuiltinPDFViewer": {
+    onBeforeUIStartup(manager, param) {
+      if (param) {
+        manager.disallowFeature("PDF.js");
+      }
+    }
+  },
+
   "DisableDeveloperTools": {
     onBeforeAddons(manager, param) {
       if (param) {
         setAndLockPref("devtools.policy.disabled", true);
         setAndLockPref("devtools.chrome.enabled", false);
 
         manager.disallowFeature("devtools");
         manager.disallowFeature("about:devtools");
         manager.disallowFeature("about:debugging");
         manager.disallowFeature("about:devtools-toolbox");
       }
     }
   },
 
+  "DisableFeedbackCommands": {
+    onBeforeUIStartup(manager, param) {
+      if (param) {
+        manager.disallowFeature("feedbackCommands");
+      }
+    }
+  },
+
   "DisableFirefoxAccounts": {
     onBeforeAddons(manager, param) {
       if (param) {
         setAndLockPref("identity.fxaccounts.enabled", false);
       }
     }
   },
 
@@ -194,16 +210,24 @@ var Policies = {
       if (param) {
         manager.disallowFeature("privatebrowsing");
         manager.disallowFeature("about:privatebrowsing", true);
         setAndLockPref("browser.privatebrowsing.autostart", false);
       }
     }
   },
 
+  "DisableSafeMode": {
+    onBeforeUIStartup(manager, param) {
+      if (param) {
+        manager.disallowFeature("safeMode");
+      }
+    }
+  },
+
   "DisableSysAddonUpdate": {
     onBeforeAddons(manager, param) {
       if (param) {
         manager.disallowFeature("SysAddonUpdate");
       }
     }
   },
 

--- a/browser/components/enterprisepolicies/schemas/policies-schema.json
+++ b/browser/components/enterprisepolicies/schemas/policies-schema.json
@@ -102,23 +102,37 @@
     "DisableAppUpdate": {
       "description": "Prevent the browser from updating.",
       "first_available": "60.0",
       "enterprise_only": true,
 
       "type": "boolean"
     },
 
+    "DisableBuiltinPDFViewer": {
+      "description": "Disables PDF.js, which displays PDFs within Firefox.",
+      "first_available": "60.0",
+
+      "type": "boolean"
+    },
+
     "DisableDeveloperTools": {
       "description": "Prevents access to developer tools.",
       "first_available": "60.0",
 
       "type": "boolean"
     },
 
+    "DisableFeedbackCommands": {
+      "description": "Prevents ability to send feedback from the help menu (\"Submit Feedback\" and \"Report Deceptive Site\").",
+      "first_available": "60.0",
+
+      "type": "boolean"
+    },
+
     "DisableFirefoxAccounts": {
       "description": "Disables Firefox Account based services, including Sync.",
       "first_available": "60.0",
 
       "type": "boolean"
     },
 
     "DisableFirefoxScreenshots": {
@@ -151,16 +165,23 @@
 
     "DisablePrivateBrowsing": {
       "description": "Disables private browsing.",
       "first_available": "60.0",
 
       "type": "boolean"
     },
 
+    "DisableSafeMode": {
+      "description": "Prevents ability to restart in safe mode.",
+      "first_available": "60.0",
+
+      "type": "boolean"
+    },
+
     "DisableSysAddonUpdate": {
       "description": "Prevent the browser from installing and updating system addons.",
       "first_available": "60.0",
       "enterprise_only": true,
 
       "type": "boolean",
       "enum": [true]
     },

--- a/browser/components/enterprisepolicies/tests/browser/browser.ini
+++ b/browser/components/enterprisepolicies/tests/browser/browser.ini
@@ -19,19 +19,22 @@ support-files =
 [browser_policy_block_about_addons.js]
 [browser_policy_block_about_config.js]
 [browser_policy_block_about_profiles.js]
 [browser_policy_block_about_support.js]
 [browser_policy_block_set_desktop_background.js]
 [browser_policy_bookmarks.js]
 [browser_policy_clear_blocked_cookies.js]
 [browser_policy_default_browser_check.js]
+[browser_policy_disable_feedback_commands.js]
 [browser_policy_disable_formhistory.js]
 [browser_policy_disable_fxaccounts.js]
 [browser_policy_disable_fxscreenshots.js]
 [browser_policy_disable_masterpassword.js]
+[browser_policy_disable_pdfjs.js]
 [browser_policy_disable_pocket.js]
 [browser_policy_disable_privatebrowsing.js]
+[browser_policy_disable_safemode.js]
 [browser_policy_disable_shield.js]
 [browser_policy_display_bookmarks.js]
 [browser_policy_display_menu.js]
 [browser_policy_remember_passwords.js]
 [browser_policy_set_homepage.js]

new file mode 100644
--- /dev/null
+++ b/browser/components/enterprisepolicies/tests/browser/browser_policy_disable_feedback_commands.js
@@ -0,0 +1,49 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+/* the buidHelpMenu() function comes from browser/base/content/utilityOverlay.js */
+
+const NORMAL_PAGE = "http://example.com";
+const PHISH_PAGE = "http://www.itisatrap.org/firefox/its-a-trap.html";
+
+async function checkItemsAreDisabled(url) {
+  await BrowserTestUtils.withNewTab({
+    gBrowser,
+    url,
+    // The phishing page doesn't send a load notification
+    waitForLoad: false,
+    waitForStateStop: true,
+  }, async function checkItems() {
+    buildHelpMenu();
+
+    let reportMenu = document.getElementById("menu_HelpPopup_reportPhishingtoolmenu");
+    is(reportMenu.getAttribute("disabled"), "true",
+       "The `Report Deceptive Site` item should be disabled");
+
+    let errorMenu = document.getElementById("menu_HelpPopup_reportPhishingErrortoolmenu");
+    is(errorMenu.getAttribute("disabled"), "true",
+       "The `This isn’t a deceptive site` item should be disabled");
+  });
+}
+
+add_task(async function test_policy_feedback_commands() {
+  await setupPolicyEngineWithJson({
+    "policies": {
+      "DisableFeedbackCommands": true
+    }
+  });
+
+  /* from browser/base/content/utilityOverlay.js */
+  buildHelpMenu();
+
+  let feedbackPageMenu = document.getElementById("feedbackPage");
+  is(feedbackPageMenu.getAttribute("disabled"), "true",
+     "The `Submit Feedback...` item should be disabled");
+
+  await checkItemsAreDisabled(NORMAL_PAGE);
+  await checkItemsAreDisabled(PHISH_PAGE);
+
+});
+

new file mode 100644
--- /dev/null
+++ b/browser/components/enterprisepolicies/tests/browser/browser_policy_disable_pdfjs.js
@@ -0,0 +1,17 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+"use strict";
+
+const {PdfJs} = ChromeUtils.import("resource://pdf.js/PdfJs.jsm", {});
+
+add_task(async function test_disable_pdfjs() {
+  is(PdfJs.enabled, true, "PDFjs should be enabled before policy runs");
+
+  await setupPolicyEngineWithJson({
+    "policies": {
+      "DisableBuiltinPDFViewer": true
+    }
+  });
+
+  is(PdfJs.enabled, false, "PDFjs should be disabled after policy runs");
+});

new file mode 100644
--- /dev/null
+++ b/browser/components/enterprisepolicies/tests/browser/browser_policy_disable_safemode.js
@@ -0,0 +1,42 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+"use strict";
+
+add_task(async function setup() {
+  await setupPolicyEngineWithJson({
+    "policies": {
+      "DisableSafeMode": true
+    }
+  });
+});
+
+add_task(async function test_help_menu() {
+  buildHelpMenu();
+  let safeModeMenu = document.getElementById("helpSafeMode");
+  is(safeModeMenu.getAttribute("disabled"), "true",
+     "The `Restart with Add-ons Disabled...` item should be disabled");
+});
+
+add_task(async function test_safemode_from_about_support() {
+  let tab = await BrowserTestUtils.openNewForegroundTab(gBrowser, "about:support");
+
+  await ContentTask.spawn(tab.linkedBrowser, null, async function() {
+    let button = content.document.getElementById("restart-in-safe-mode-button");
+    is(button.getAttribute("disabled"), "true",
+       "The `Restart with Add-ons Disabled...` button should be disabled");
+  });
+
+  await BrowserTestUtils.removeTab(tab);
+});
+
+add_task(async function test_safemode_from_about_profiles() {
+  let tab = await BrowserTestUtils.openNewForegroundTab(gBrowser, "about:profiles");
+
+  await ContentTask.spawn(tab.linkedBrowser, null, async function() {
+    let button = content.document.getElementById("restart-in-safe-mode-button");
+    is(button.getAttribute("disabled"), "true",
+       "The `Restart with Add-ons Disabled...` button should be disabled");
+  });
+
+  await BrowserTestUtils.removeTab(tab);
+});

--- a/browser/components/extensions/test/browser/browser-common.ini
+++ b/browser/components/extensions/test/browser/browser-common.ini
@@ -46,16 +46,17 @@ skip-if = os == 'win' || os == 'mac' # B
 [browser_ext_browserAction_contextMenu.js]
 # bug 1369197
 skip-if = os == 'linux'
 [browser_ext_browserAction_disabled.js]
 [browser_ext_browserAction_pageAction_icon.js]
 [browser_ext_browserAction_pageAction_icon_permissions.js]
 [browser_ext_browserAction_popup.js]
 skip-if = (debug && os == 'linux' && bits == 32) || (os == 'win' && !debug) # Bug 1313372, win: Bug 1285500
+[browser_ext_browserAction_popup_port.js]
 [browser_ext_browserAction_popup_preload.js]
 skip-if = (os == 'win' && !debug) # bug 1352668
 [browser_ext_browserAction_popup_resize.js]
 [browser_ext_browserAction_simple.js]
 [browser_ext_browserAction_telemetry.js]
 [browser_ext_browserAction_theme_icons.js]
 [browser_ext_browsingData_formData.js]
 [browser_ext_browsingData_history.js]

new file mode 100644
--- /dev/null
+++ b/browser/components/extensions/test/browser/browser_ext_browserAction_popup_port.js
@@ -0,0 +1,52 @@
+/* -*- Mode: indent-tabs-mode: nil; js-indent-level: 2 -*- */
+/* vim: set sts=2 sw=2 et tw=80: */
+"use strict";
+
+let scriptPage = url => `<html><head><meta charset="utf-8"><script src="${url}"></script></head><body>${url}</body></html>`;
+
+// Tests that message ports still function correctly after a browserAction popup
+// <browser> has been reparented.
+add_task(async function test_browserActionPort() {
+  let extension = ExtensionTestUtils.loadExtension({
+    manifest: {
+      "browser_action": {
+        "default_popup": "popup.html",
+        "browser_style": true,
+      },
+    },
+
+    background() {
+      new Promise(resolve => {
+        browser.runtime.onConnect.addListener(port => {
+          resolve(Promise.all([
+            new Promise(r => port.onMessage.addListener(r)),
+            new Promise(r => port.onDisconnect.addListener(r)),
+          ]));
+        });
+      }).then(([msg]) => {
+        browser.test.assertEq("Hallo.", msg, "Got expected message");
+        browser.test.notifyPass("browserAction-popup-port");
+      });
+    },
+
+    files: {
+      "popup.html": scriptPage("popup.js"),
+      "popup.js"() {
+        let port = browser.runtime.connect();
+        window.onload = () => {
+          setTimeout(() => {
+            port.postMessage("Hallo.");
+            window.close();
+          }, 0);
+        };
+      },
+    },
+  });
+
+  await extension.startup();
+
+  await clickBrowserAction(extension);
+
+  await extension.awaitFinish("browserAction-popup-port");
+  await extension.unload();
+});

new file mode 100644
--- /dev/null
+++ b/browser/docs/BrowserErrorReporter.rst
@@ -0,0 +1,48 @@
+.. _browsererrorreporter:
+
+=======================
+Browser Error Reporter
+=======================
+
+The `BrowserErrorReporter.jsm <https://dxr.mozilla.org/mozilla-central/source/browser/modules/BrowserErrorReporter.jsm>`_ module collects errors logged to the Browser Console and sends them to a remote error aggregation service.
+
+.. note::
+   This module and the related service is a prototype and will be removed from Firefox in later 2018.
+
+Opt-out
+=======
+Collection is enabled by default in the Nightly channel, except for local builds, where it is disabled. It is not available outside of the Nightly channel.
+
+To opt-out of collection:
+
+1. Open ``about:preferences``.
+2. Select the Privacy and Security panel and go to the Nightly Data Collection and Use section.
+3. Uncheck "Allow Nightly to send browser error reports (including error messages) to Mozilla".
+
+Collected Error Data
+====================
+Errors are first sampled at the rate specified by the ``browser.chrome.errorReporter.sampleRate`` preference.
+
+The payload sent to the remote collection service contains the following info:
+
+- Firefox version number
+- Firefox update channel (usually "Nightly")
+- Firefox build ID
+- Revision used to build Firefox
+- Timestamp when the error occurred
+- A project ID specified by the ``browser.chrome.errorReporter.projectId`` preference
+- The error message
+- The filename that the error was thrown from
+- A stacktrace, if available, of the code being executed when the error was thrown
+
+Privacy-sensitive info
+======================
+Error reports may contain sensitive information about the user:
+
+- Error messages may inadvertently contain personal info depending on the code that generated the error.
+- Filenames in the stack trace may contain add-on IDs of currently-installed add-ons. They may also contain local filesystem paths.
+
+.. seealso::
+
+   `Browser Error Collection wiki page <https://wiki.mozilla.org/Firefox/BrowserErrorCollection>`_
+      Wiki page with up-to-date information on error collection and how we restrict access to the collected data.

--- a/browser/docs/index.rst
+++ b/browser/docs/index.rst
@@ -4,8 +4,9 @@ Firefox
 
 This is the nascent documentation of the Firefox front-end code.
 
 .. toctree::
    :maxdepth: 1
 
    UITelemetry
    BrowserUsageTelemetry
+   BrowserErrorReporter

--- a/browser/extensions/pdfjs/content/PdfJs.jsm
+++ b/browser/extensions/pdfjs/content/PdfJs.jsm
@@ -332,16 +332,20 @@ var PdfJs = {
   },
 
   /**
    * pdf.js is only enabled if it is both selected as the pdf viewer and if the
    * global switch enabling it is true.
    * @return {boolean} Whether or not it's enabled.
    */
   get enabled() {
+    if (!Services.policies.isAllowed("PDF.js")) {
+      return false;
+    }
+
     if (!Services.prefs.getBoolPref(PREF_ENABLED_CACHE_INITIALIZED, false)) {
       // If we just updated, and the cache hasn't been initialized, then we
       // can't assume a default state, and need to synchronously initialize
       // PdfJs
       if (Services.prefs.prefHasUserValue(PREF_APP_UPDATE_POSTUPDATE)) {
         this.checkEnabled();
       }
 

--- a/browser/modules/BrowserErrorReporter.jsm
+++ b/browser/modules/BrowserErrorReporter.jsm
@@ -50,19 +50,20 @@ const REPORTED_CATEGORIES = new Set([
  * The outgoing requests are designed to be compatible with Sentry. See
  * https://docs.sentry.io/clientdev/ for details on the data format that Sentry
  * expects.
  *
  * Errors may contain PII, such as in messages or local file paths in stack
  * traces; see bug 1426482 for privacy review and server-side mitigation.
  */
 class BrowserErrorReporter {
-  constructor(fetchMethod = this._defaultFetch) {
-    // A fake fetch is passed by the tests to avoid network connections
+  constructor(fetchMethod = this._defaultFetch, chromeOnly = true) {
+    // Test arguments for mocks and changing behavior
     this.fetch = fetchMethod;
+    this.chromeOnly = chromeOnly;
 
     // Values that don't change between error reports.
     this.requestBodyTemplate = {
       logger: "javascript",
       platform: "javascript",
       release: Services.appinfo.version,
       environment: UpdateUtils.getUpdateChannel(false),
       tags: {
@@ -128,53 +129,71 @@ class BrowserErrorReporter {
     try {
       message.QueryInterface(Ci.nsIScriptError);
     } catch (err) {
       return; // Not an error
     }
 
     const isWarning = message.flags & message.warningFlag;
     const isFromChrome = REPORTED_CATEGORIES.has(message.category);
-    if (!isFromChrome || isWarning) {
+    if ((this.chromeOnly && !isFromChrome) || isWarning) {
       return;
     }
 
     // Sample the amount of errors we send out
     const sampleRate = Number.parseFloat(Services.prefs.getCharPref(PREF_SAMPLE_RATE));
     if (!Number.isFinite(sampleRate) || (Math.random() >= sampleRate)) {
       return;
     }
 
+    const extensions = new Map();
+    for (let extension of WebExtensionPolicy.getActiveExtensions()) {
+      extensions.set(extension.mozExtensionHostname, extension);
+    }
+
+    // Replaces any instances of moz-extension:// URLs with internal UUIDs to use
+    // the add-on ID instead.
+    function mangleExtURL(string, anchored = true) {
+      let re = new RegExp(`${anchored ? "^" : ""}moz-extension://([^/]+)/`, "g");
+
+      return string.replace(re, (m0, m1) => {
+        let id = extensions.has(m1) ? extensions.get(m1).id : m1;
+        return `moz-extension://${id}/`;
+      });
+    }
+
     // Parse the error type from the message if present (e.g. "TypeError: Whoops").
     let errorMessage = message.errorMessage;
     let errorName = "Error";
     if (message.errorMessage.match(ERROR_PREFIX_RE)) {
       const parts = message.errorMessage.split(":");
       errorName = parts[0];
       errorMessage = parts.slice(1).join(":").trim();
     }
 
     const frames = [];
     let frame = message.stack;
     // Avoid an infinite loop by limiting traces to 100 frames.
     while (frame && frames.length < 100) {
-      frames.push(await this.normalizeStackFrame(frame));
+      const normalizedFrame = await this.normalizeStackFrame(frame);
+      normalizedFrame.module = mangleExtURL(normalizedFrame.module, false);
+      frames.push(normalizedFrame);
       frame = frame.parent;
     }
     // Frames are sent in order from oldest to newest.
     frames.reverse();
 
     const requestBody = Object.assign({}, this.requestBodyTemplate, {
       timestamp: new Date().toISOString().slice(0, -1), // Remove trailing "Z"
       project: Services.prefs.getCharPref(PREF_PROJECT_ID),
       exception: {
         values: [
           {
             type: errorName,
-            value: errorMessage,
+            value: mangleExtURL(errorMessage),
             module: message.sourceName,
             stacktrace: {
               frames,
             }
           },
         ],
       },
       culprit: message.sourceName,

--- a/browser/modules/test/browser/browser_BrowserErrorReporter.js
+++ b/browser/modules/test/browser/browser_BrowserErrorReporter.js
@@ -1,12 +1,13 @@
 /* Any copyright is dedicated to the Public Domain.
  * http://creativecommons.org/publicdomain/zero/1.0/ */
 "use strict";
 
+ChromeUtils.import("resource://testing-common/AddonTestUtils.jsm", this);
 ChromeUtils.import("resource:///modules/BrowserErrorReporter.jsm", this);
 
 /* global sinon */
 Services.scriptloader.loadSubScript("resource://testing-common/sinon-2.3.2.js");
 registerCleanupFunction(function() {
   delete window.sinon;
 });
 
@@ -401,8 +402,50 @@ add_task(async function testFetchArgumen
       },
       "Reporter builds stack trace from scriptError correctly.",
     );
   });
 
   reporter.uninit();
   resetConsole();
 });
+
+add_task(async function testAddonIDMangle() {
+  const fetchSpy = sinon.spy();
+  // Passing false here disables category checks on errors, which would
+  // otherwise block errors directly from extensions.
+  const reporter = new BrowserErrorReporter(fetchSpy, false);
+  await SpecialPowers.pushPrefEnv({set: [
+    [PREF_ENABLED, true],
+    [PREF_SAMPLE_RATE, "1.0"],
+  ]});
+  reporter.init();
+
+  // Create and install test add-on
+  const id = "browsererrorcollection@example.com";
+  const extension = ExtensionTestUtils.loadExtension({
+    manifest: {
+      applications: {
+        gecko: { id },
+      },
+    },
+    background() {
+      throw new Error("testAddonIDMangle error");
+    },
+  });
+  await extension.startup();
+
+  // Just in case the error hasn't been thrown before add-on startup.
+  const call = await TestUtils.waitForCondition(
+    () => fetchCallForMessage(fetchSpy, "testAddonIDMangle error"),
+    `Wait for error from ${id} to be logged`,
+  );
+  const body = JSON.parse(call.args[1].body);
+  const stackFrame = body.exception.values[0].stacktrace.frames[0];
+  ok(
+    stackFrame.module.startsWith(`moz-extension://${id}/`),
+    "Stack frame filenames use the proper add-on ID instead of internal UUIDs.",
+  );
+
+  await extension.unload();
+  reporter.uninit();
+  resetConsole();
+});

--- a/devtools/server/actors/addon.js
+++ b/devtools/server/actors/addon.js
@@ -212,17 +212,17 @@ BrowserAddonActor.prototype = {
       if (metadata) {
         return metadata.addonID === this.id;
       }
     } catch (e) {
       // ignore
     }
 
     if (global instanceof Ci.nsIDOMWindow) {
-      return global.document.nodePrincipal.addonId;
+      return global.document.nodePrincipal.addonId == this.id;
     }
 
     return false;
   },
 
   /**
    * Override the eligibility check for scripts and sources to make
    * sure every script and source with a URL is stored when debugging

--- a/dom/base/EventSource.cpp
+++ b/dom/base/EventSource.cpp
@@ -10,16 +10,17 @@
 #include "mozilla/DebugOnly.h"
 #include "mozilla/LoadInfo.h"
 #include "mozilla/DOMEventTargetHelper.h"
 #include "mozilla/dom/EventSourceBinding.h"
 #include "mozilla/dom/MessageEvent.h"
 #include "mozilla/dom/MessageEventBinding.h"
 #include "mozilla/dom/ScriptSettings.h"
 #include "mozilla/dom/WorkerPrivate.h"
+#include "mozilla/dom/WorkerRef.h"
 #include "mozilla/dom/WorkerRunnable.h"
 #include "mozilla/dom/WorkerScope.h"
 #include "mozilla/UniquePtrExtensions.h"
 #include "nsAutoPtr.h"
 #include "nsIThreadRetargetableStreamListener.h"
 #include "nsNetUtil.h"
 #include "nsIAuthPrompt.h"
 #include "nsIAuthPrompt2.h"
@@ -138,18 +139,18 @@ public:
   nsresult AddWindowObservers();
   void RemoveWindowObservers();
 
   void CloseInternal();
   void CleanupOnMainThread();
   void AddRefObject();
   void ReleaseObject();
 
-  bool RegisterWorkerHolder();
-  void UnregisterWorkerHolder();
+  bool CreateWorkerRef(WorkerPrivate* aWorkerPrivate);
+  void ReleaseWorkerRef();
 
   void AssertIsOnTargetThread() const
   {
     MOZ_ASSERT(IsTargetThread());
   }
 
   bool IsTargetThread() const
   {
@@ -277,21 +278,18 @@ public:
   UniquePtr<Message> mCurrentMessage;
   nsDeque mMessagesToDispatch;
   ParserStatus mStatus;
   mozilla::UniquePtr<mozilla::Decoder> mUnicodeDecoder;
   nsString mLastFieldName;
   nsString mLastFieldValue;
 
   // EventSourceImpl internal states.
-  // The worker private where the EventSource is created. nullptr if created on
-  // main thread. (accessed on worker thread only)
-  WorkerPrivate* mWorkerPrivate;
-  // Holder to worker to keep worker alive. (accessed on worker thread only)
-  nsAutoPtr<WorkerHolder> mWorkerHolder;
+  // WorkerRef to keep the worker alive. (accessed on worker thread only)
+  RefPtr<ThreadSafeWorkerRef> mWorkerRef;
   // This mutex protects mFrozen and mEventSource->mReadyState that are used in
   // different threads.
   mozilla::Mutex mMutex;
   // Whether the window is frozen. May be set on main thread and read on target
   // thread. Use mMutex to protect it before accessing it.
   bool mFrozen;
   // There are some messages are going to be dispatched when thaw.
   bool mGoingToDispatchAllMessages;
@@ -348,32 +346,30 @@ EventSourceImpl::EventSourceImpl(EventSo
   , mIsMainThread(NS_IsMainThread())
   , mIsShutDown(false)
   , mScriptLine(0)
   , mScriptColumn(0)
   , mInnerWindowID(0)
 {
   MOZ_ASSERT(mEventSource);
   if (!mIsMainThread) {
-    mWorkerPrivate = GetCurrentThreadWorkerPrivate();
-    MOZ_ASSERT(mWorkerPrivate);
     mEventSource->mIsMainThread = false;
   }
   SetReadyState(CONNECTING);
 }
 
 class CleanupRunnable final : public WorkerMainThreadRunnable
 {
 public:
   explicit CleanupRunnable(EventSourceImpl* aEventSourceImpl)
-    : WorkerMainThreadRunnable(aEventSourceImpl->mWorkerPrivate,
+    : WorkerMainThreadRunnable(GetCurrentThreadWorkerPrivate(),
                                NS_LITERAL_CSTRING("EventSource :: Cleanup"))
     , mImpl(aEventSourceImpl)
   {
-    mImpl->mWorkerPrivate->AssertIsOnWorkerThread();
+    mWorkerPrivate->AssertIsOnWorkerThread();
   }
 
   bool MainThreadRun() override
   {
     mImpl->CleanupOnMainThread();
     return true;
   }
 
@@ -408,17 +404,17 @@ EventSourceImpl::CloseInternal()
     CleanupOnMainThread();
   } else {
     ErrorResult rv;
     // run CleanupOnMainThread synchronously on main thread since it touches
     // observers and members only can be accessed on main thread.
     RefPtr<CleanupRunnable> runnable = new CleanupRunnable(this);
     runnable->Dispatch(Killing, rv);
     MOZ_ASSERT(!rv.Failed());
-    UnregisterWorkerHolder();
+    ReleaseWorkerRef();
   }
 
   while (mMessagesToDispatch.GetSize() != 0) {
     delete static_cast<Message*>(mMessagesToDispatch.PopFront());
   }
   SetFrozen(false);
   ResetDecoder();
   mUnicodeDecoder = nullptr;
@@ -447,30 +443,32 @@ void EventSourceImpl::CleanupOnMainThrea
   ResetConnection();
   mPrincipal = nullptr;
   mSrc = nullptr;
 }
 
 class InitRunnable final : public WorkerMainThreadRunnable
 {
 public:
-  explicit InitRunnable(EventSourceImpl* aEventSourceImpl,
-                        const nsAString& aURL)
-    : WorkerMainThreadRunnable(aEventSourceImpl->mWorkerPrivate,
+  InitRunnable(WorkerPrivate* aWorkerPrivate,
+               EventSourceImpl* aEventSourceImpl,
+               const nsAString& aURL)
+    : WorkerMainThreadRunnable(aWorkerPrivate,
                                NS_LITERAL_CSTRING("EventSource :: Init"))
     , mImpl(aEventSourceImpl)
     , mURL(aURL)
   {
-    mImpl->mWorkerPrivate->AssertIsOnWorkerThread();
+    MOZ_ASSERT(aWorkerPrivate);
+    aWorkerPrivate->AssertIsOnWorkerThread();
   }
 
   bool MainThreadRun() override
   {
     // Get principal from worker's owner document or from worker.
-    WorkerPrivate* wp = mImpl->mWorkerPrivate;
+    WorkerPrivate* wp = mWorkerPrivate;
     while (wp->GetParent()) {
       wp = wp->GetParent();
     }
     nsPIDOMWindowInner* window = wp->GetWindow();
     nsIDocument* doc = window ? window->GetExtantDoc() : nullptr;
     nsCOMPtr<nsIPrincipal> principal = doc ? doc->NodePrincipal() :
                                              wp->GetPrincipal();
     if (!principal) {
@@ -480,23 +478,46 @@ public:
     ErrorResult rv;
     mImpl->Init(principal, mURL, rv);
     mRv = rv.StealNSResult();
     return true;
   }
 
   nsresult ErrorCode() const { return mRv; }
 
-protected:
+private:
   // Raw pointer because this runnable is sync.
   EventSourceImpl* mImpl;
   const nsAString& mURL;
   nsresult mRv;
 };
 
+class ConnectRunnable final : public WorkerMainThreadRunnable
+{
+public:
+  explicit ConnectRunnable(WorkerPrivate* aWorkerPrivate,
+                           EventSourceImpl* aEventSourceImpl)
+    : WorkerMainThreadRunnable(aWorkerPrivate,
+                               NS_LITERAL_CSTRING("EventSource :: Connect"))
+    , mImpl(aEventSourceImpl)
+  {
+    MOZ_ASSERT(aWorkerPrivate);
+    aWorkerPrivate->AssertIsOnWorkerThread();
+  }
+
+  bool MainThreadRun() override
+  {
+    mImpl->InitChannelAndRequestEventSource();
+    return true;
+  }
+
+private:
+  RefPtr<EventSourceImpl> mImpl;
+};
+
 nsresult
 EventSourceImpl::ParseURL(const nsAString& aURL)
 {
   AssertIsOnMainThread();
   MOZ_ASSERT(!IsShutDown());
   // get the src
   nsCOMPtr<nsIURI> baseURI;
   nsresult rv = GetBaseURI(getter_AddRefs(baseURI));
@@ -580,21 +601,16 @@ EventSourceImpl::Init(nsIPrincipal* aPri
     }
   }
 
   mReconnectionTime =
     Preferences::GetInt("dom.server-events.default-reconnection-time",
                         DEFAULT_RECONNECTION_TIME_VALUE);
 
   mUnicodeDecoder = UTF_8_ENCODING->NewDecoderWithBOMRemoval();
-
-  // the constructor should throw a SYNTAX_ERROR only if it fails resolving the
-  // url parameter, so we don't care about the InitChannelAndRequestEventSource
-  // result.
-  InitChannelAndRequestEventSource();
 }
 
 //-----------------------------------------------------------------------------
 // EventSourceImpl::nsIObserver
 //-----------------------------------------------------------------------------
 
 NS_IMETHODIMP
 EventSourceImpl::Observe(nsISupports* aSubject,
@@ -1126,21 +1142,21 @@ EventSourceImpl::ResetDecoder()
   ClearFields();
 }
 
 class CallRestartConnection final : public WorkerMainThreadRunnable
 {
 public:
   explicit CallRestartConnection(EventSourceImpl* aEventSourceImpl)
     : WorkerMainThreadRunnable(
-        aEventSourceImpl->mWorkerPrivate,
+        aEventSourceImpl->mWorkerRef->Private(),
         NS_LITERAL_CSTRING("EventSource :: RestartConnection"))
     , mImpl(aEventSourceImpl)
   {
-    mImpl->mWorkerPrivate->AssertIsOnWorkerThread();
+    mWorkerPrivate->AssertIsOnWorkerThread();
   }
 
   bool MainThreadRun() override
   {
     mImpl->RestartConnection();
     return true;
   }
 
@@ -1471,18 +1487,18 @@ EventSourceImpl::DispatchAllMessageEvent
   }
 
   AutoJSAPI jsapi;
   if (mIsMainThread) {
     if (NS_WARN_IF(!jsapi.Init(mEventSource->GetOwner()))) {
       return;
     }
   } else {
-    MOZ_ASSERT(mWorkerPrivate);
-    if (NS_WARN_IF(!jsapi.Init(mWorkerPrivate->GlobalScope()))) {
+    MOZ_ASSERT(mWorkerRef);
+    if (NS_WARN_IF(!jsapi.Init(mWorkerRef->Private()->GlobalScope()))) {
       return;
     }
   }
   JSContext* cx = jsapi.cx();
 
   while (mMessagesToDispatch.GetSize() > 0) {
     UniquePtr<Message> message(static_cast<Message*>(mMessagesToDispatch.PopFront()));
     // Now we can turn our string into a jsval
@@ -1772,38 +1788,16 @@ EventSourceImpl::AddRefObject()
 
 void
 EventSourceImpl::ReleaseObject()
 {
   Release();
 }
 
 namespace {
-class EventSourceWorkerHolder final : public WorkerHolder
-{
-public:
-  explicit EventSourceWorkerHolder(EventSourceImpl* aEventSourceImpl)
-    : WorkerHolder("EventSourceWorkerHolder")
-    , mEventSourceImpl(aEventSourceImpl)
-  {
-  }
-
-  bool Notify(WorkerStatus aStatus) override
-  {
-    MOZ_ASSERT(aStatus > Running);
-    if (aStatus >= Canceling) {
-      mEventSourceImpl->Close();
-    }
-    return true;
-  }
-
-private:
-  // Raw pointer because the EventSourceImpl object keeps alive the holder.
-  EventSourceImpl* mEventSourceImpl;
-};
 
 class WorkerRunnableDispatcher final : public WorkerRunnable
 {
   RefPtr<EventSourceImpl> mEventSourceImpl;
 
 public:
   WorkerRunnableDispatcher(EventSourceImpl* aImpl,
                            WorkerPrivate* aWorkerPrivate,
@@ -1844,40 +1838,42 @@ public:
   }
 
 private:
   nsCOMPtr<nsIRunnable> mEvent;
 };
 
 } // namespace
 
-bool EventSourceImpl::RegisterWorkerHolder()
+bool EventSourceImpl::CreateWorkerRef(WorkerPrivate* aWorkerPrivate)
 {
   MOZ_ASSERT(!IsShutDown());
-  MOZ_ASSERT(mWorkerPrivate);
-  mWorkerPrivate->AssertIsOnWorkerThread();
-  MOZ_ASSERT(!mWorkerHolder);
-  mWorkerHolder = new EventSourceWorkerHolder(this);
-  if (NS_WARN_IF(!mWorkerHolder->HoldWorker(mWorkerPrivate, Canceling))) {
-    mWorkerHolder = nullptr;
+  MOZ_ASSERT(!mWorkerRef);
+  MOZ_ASSERT(aWorkerPrivate);
+  aWorkerPrivate->AssertIsOnWorkerThread();
+
+  RefPtr<EventSourceImpl> self = this;
+  RefPtr<StrongWorkerRef> workerRef =
+    StrongWorkerRef::Create(aWorkerPrivate, "EventSource", [self]() {
+      self->Close();
+    });
+
+  if (NS_WARN_IF(!workerRef)) {
     return false;
   }
+
+  mWorkerRef = new ThreadSafeWorkerRef(workerRef);
   return true;
 }
 
-void EventSourceImpl::UnregisterWorkerHolder()
+void EventSourceImpl::ReleaseWorkerRef()
 {
-  // RegisterWorkerHolder fail will destroy EventSourceImpl and invoke
-  // UnregisterWorkerHolder.
   MOZ_ASSERT(IsClosed());
-  MOZ_ASSERT(mWorkerPrivate);
-  mWorkerPrivate->AssertIsOnWorkerThread();
-  // The DTOR of this WorkerHolder will release the worker for us.
-  mWorkerHolder = nullptr;
-  mWorkerPrivate = nullptr;
+  MOZ_ASSERT(IsCurrentThreadRunningWorker());
+  mWorkerRef = nullptr;
 }
 
 //-----------------------------------------------------------------------------
 // EventSourceImpl::nsIEventTarget
 //-----------------------------------------------------------------------------
 NS_IMETHODIMP
 EventSourceImpl::DispatchFromScript(nsIRunnable* aEvent, uint32_t aFlags)
 {
@@ -1891,21 +1887,21 @@ EventSourceImpl::Dispatch(already_AddRef
   nsCOMPtr<nsIRunnable> event_ref(aEvent);
   if (mIsMainThread) {
     return NS_DispatchToMainThread(event_ref.forget());
   }
 
   if (IsShutDown()) {
     return NS_OK;
   }
-  MOZ_ASSERT(mWorkerPrivate);
+
   // If the target is a worker, we have to use a custom WorkerRunnableDispatcher
   // runnable.
   RefPtr<WorkerRunnableDispatcher> event =
-    new WorkerRunnableDispatcher(this, mWorkerPrivate, event_ref.forget());
+    new WorkerRunnableDispatcher(this, mWorkerRef->Private(), event_ref.forget());
 
   if (!event->Dispatch()) {
     return NS_ERROR_FAILURE;
   }
   return NS_OK;
 }
 
 
@@ -1977,33 +1973,63 @@ EventSource::Constructor(const GlobalObj
       return nullptr;
     }
     nsCOMPtr<nsIPrincipal> principal = scriptPrincipal->GetPrincipal();
     if (!principal) {
       aRv.Throw(NS_ERROR_FAILURE);
       return nullptr;
     }
     eventSourceImp->Init(principal, aURL, aRv);
-  } else {
-    // In workers we have to keep the worker alive using a WorkerHolder in order
-    // to dispatch messages correctly.
-    if (!eventSourceImp->RegisterWorkerHolder()) {
-      aRv.Throw(NS_ERROR_FAILURE);
-      return nullptr;
-    }
-    RefPtr<InitRunnable> runnable = new InitRunnable(eventSourceImp, aURL);
-    runnable->Dispatch(Terminating, aRv);
     if (NS_WARN_IF(aRv.Failed())) {
       return nullptr;
     }
-    aRv = runnable->ErrorCode();
+
+    eventSourceImp->InitChannelAndRequestEventSource();
+    return eventSource.forget();
   }
+
+  // Worker side.
+  WorkerPrivate* workerPrivate = GetCurrentThreadWorkerPrivate();
+  MOZ_ASSERT(workerPrivate);
+
+  RefPtr<InitRunnable> initRunnable =
+    new InitRunnable(workerPrivate, eventSourceImp, aURL);
+  initRunnable->Dispatch(Terminating, aRv);
+  if (NS_WARN_IF(aRv.Failed())) {
+    return nullptr;
+  }
+
+  aRv = initRunnable->ErrorCode();
   if (NS_WARN_IF(aRv.Failed())) {
     return nullptr;
   }
+
+  // In workers we have to keep the worker alive using a WorkerRef in order
+  // to dispatch messages correctly.
+  if (!eventSourceImp->CreateWorkerRef(workerPrivate)) {
+    // The worker is already shutting down. Let's return an already closed
+    // object, but marked as Connecting.
+    eventSource->Close();
+
+    // EventSourceImpl must be released before returning the object, otherwise
+    // it will set EventSource to a CLOSED state in its DTOR.
+    eventSourceImp = nullptr;
+
+    eventSource->mReadyState = EventSourceImpl::CONNECTING;
+    return eventSource.forget();
+  }
+
+  // Let's connect to the server.
+  RefPtr<ConnectRunnable> connectRunnable =
+    new ConnectRunnable(workerPrivate, eventSourceImp);
+  connectRunnable->Dispatch(Terminating, aRv);
+  if (NS_WARN_IF(aRv.Failed())) {
+    return nullptr;
+  }
+
   return eventSource.forget();
 }
 
 // nsWrapperCache
 JSObject*
 EventSource::WrapObject(JSContext* aCx,
                         JS::Handle<JSObject*> aGivenProto)
 {

--- a/dom/canvas/WebGLProgram.h
+++ b/dom/canvas/WebGLProgram.h
@@ -80,17 +80,17 @@ struct CachedDrawFetchLimits final {
     uint64_t maxVerts;
     uint64_t maxInstances;
 };
 
 struct LinkedProgramInfo final
     : public RefCounted<LinkedProgramInfo>
     , public SupportsWeakPtr<LinkedProgramInfo>
 {
-    friend class WebGLProgram;
+    friend class mozilla::WebGLProgram;
 
     MOZ_DECLARE_REFCOUNTED_TYPENAME(LinkedProgramInfo)
     MOZ_DECLARE_WEAKREFERENCE_TYPENAME(LinkedProgramInfo)
 
     //////
 
     WebGLProgram* const prog;
     const GLenum transformFeedbackBufferMode;

--- a/extensions/spellcheck/locales/en-US/hunspell/en-US.dic
+++ b/extensions/spellcheck/locales/en-US/hunspell/en-US.dic
@@ -1,9 +1,9 @@
-52547
+52568
 0/nm
 0th/pt
 1/n1
 1st/p
 1th/tc
 2/nm
 2nd/p
 2th/tc
@@ -14708,16 +14708,17 @@ anticlockwise
 anticoagulant/MS
 anticommunism/M
 anticommunist/SM
 anticyclone/SM
 anticyclonic
 antidemocratic
 antidepressant/MS
 antidote/MS
+antifa
 antifascist/MS
 antifreeze/M
 antigen/SM
 antigenic
 antigenicity/M
 antihero/M
 antiheroes
 antihistamine/SM
@@ -16931,16 +16932,17 @@ blobbing
 bloc/SM
 block's
 block/UGDS
 blockade/MZGDRS
 blockader/M
 blockage/MS
 blockbuster/SM
 blockbusting/M
+blockchain/S
 blocker/MS
 blockhead/SM
 blockhouse/MS
 blog/SM
 blogged
 blogger/MS
 blogging
 blogroll/SM
@@ -22423,16 +22425,17 @@ demonology/SM
 demonstrability
 demonstrable/I
 demonstrably
 demonstrate/XGNVDS
 demonstration/M
 demonstrative/MYSP
 demonstrativeness/M
 demonstrator/MS
+demonym/S
 demote/GD
 demotic
 demount
 demulcent/SM
 demur/TMRS
 demure/PY
 demureness/M
 demurral/SM
@@ -24428,16 +24431,17 @@ embed/S
 embedded
 embedding
 embellish/LGDS
 embellishment/SM
 ember/SM
 embezzle/ZGLDRS
 embezzlement/M
 embezzler/M
+embiggen
 embitter/GLDS
 embitterment/M
 emblazon/GDLS
 emblazonment/M
 emblem/SM
 emblematic
 emblematically
 embodiment/EM
@@ -27916,16 +27920,17 @@ gladiolus/M
 gladness/M
 gladsome
 glam
 glamor/SGMD
 glamorization/M
 glamorize/DSG
 glamorous/Y
 glamour/GMDS
+glamping
 glance/DSMG
 gland/SM
 glandes
 glandular
 glans/M
 glare/DSMG
 glaring/Y
 glasnost/M
@@ -28756,16 +28761,17 @@ hacking/M
 hackish
 hackle/MS
 hackney/SMDG
 hacksaw/SM
 hacktivist/MS
 hackwork/M
 had
 haddock/SM
+hadith/S
 hadn't
 hadst
 hafnium/M
 haft/MS
 hag/SM
 haggard/YP
 haggardness/M
 haggis/MS
@@ -28991,16 +28997,17 @@ hardworking
 hardy/PTR
 hare/MGDS
 harebell/MS
 harebrained
 harelip/SM
 harelipped
 harem/SM
 haricot/S
+harissa
 hark/DGS
 harlequin/SM
 harlot/SM
 harlotry/M
 harm/MDGS
 harmed/U
 harmful/YP
 harmfulness/M
@@ -29629,16 +29636,17 @@ hobbyhorse/MS
 hobbyist/SM
 hobgoblin/MS
 hobnail/SGMD
 hobnob/S
 hobnobbed
 hobnobbing
 hobo/MS
 hoboes
+hoc
 hock/MDSG
 hockey/M
 hockshop/MS
 hod/SM
 hodgepodge/SM
 hoe/SM
 hoecake/SM
 hoedown/SM
@@ -32133,16 +32141,17 @@ juxtapose/DSG
 juxtaposition/SM
 k/IFGS
 kHz
 kW
 kWh
 kabbala
 kabbalah
 kabob/SM
+kabocha
 kaboom
 kabuki/M
 kaddish/MS
 kaffeeklatch/MS
 kaffeeklatsch/MS
 kahuna/S
 kaiser/MS
 kale/M
@@ -32417,16 +32426,17 @@ knuckleduster/S
 knucklehead/MS
 knurl/SGMD
 koala/SM
 koan/S
 kohl
 kohlrabi/M
 kohlrabies
 kola/MS
+kombucha
 kook/MS
 kookaburra/SM
 kookiness/M
 kooky/TPR
 kopeck/MS
 kopek/SM
 korma
 kosher/DSG
@@ -34722,23 +34732,25 @@ microbiologist/MS
 microbiology/M
 microbrewery/SM
 microchip/MS
 microcircuit/SM
 microcode
 microcomputer/MS
 microcosm/MS
 microcosmic
+microcredit
 microdot/SM
 microeconomics/M
 microelectronic/S
 microelectronics/M
 microfiber/MS
 microfiche/M
 microfilm/GMDS
+microfinance
 microfloppies
 microgroove/SM
 microlight/MS
 microloan/MS
 micromanage/GDSL
 micromanagement/M
 micrometeorite/SM
 micrometer/MS
@@ -35253,16 +35265,17 @@ moil/MDSG
 moire/SM
 moist/XTPNRY
 moisten/DRZG
 moistener/M
 moistness/M
 moisture/M
 moisturize/ZGDRS
 moisturizer/M
+mojo/S
 molar/SM
 molasses/M
 mold/MDRJSZG
 moldboard/SM
 molder/GMD
 moldiness/M
 molding/M
 moldy/TPR
@@ -36138,16 +36151,17 @@ neighbor/SMDYG
 neighborhood/SM
 neighborliness/M
 neighs
 neither
 nelson/SM
 nematode/SM
 nemeses
 nemesis/M
+neoadjuvant
 neoclassic
 neoclassical
 neoclassicism/M
 neocolonialism/M
 neocolonialist/MS
 neocon/SM
 neoconservative/SM
 neodymium/M
@@ -37990,16 +38004,17 @@ oxidize/ZGDRS
 oxidizer/M
 oxtail/S
 oxyacetylene/M
 oxygen/M
 oxygenate/DSGN
 oxygenation/M
 oxymora
 oxymoron/M
+oy
 oyes
 oyez
 oyster/SM
 oz
 ozone/M
 p/NRXTGJ
 pH
 pa/SMH
@@ -42407,16 +42422,17 @@ resp
 respect/ESGVMD
 respectability/M
 respectable
 respectably
 respectful/EY
 respectfulness/M
 respective/Y
 respell/SGD
+respellings
 respiration/M
 respirator/SM
 respiratory
 respire/DG
 resplendence/M
 resplendent/Y
 respond/SGD
 respondent/SM
@@ -44941,16 +44957,17 @@ sisterly/P
 sit/S
 sitar/SM
 sitarist/MS
 sitcom/SM
 site/MGDS
 sitemap/SM
 sitter/SM
 sitting/SM
+situ
 situate/DSXGN
 situation/M
 situational
 six/MSH
 sixfold
 sixpence/MS
 sixshooter/M
 sixteen/SMH
@@ -45399,17 +45416,17 @@ snarkily
 snarky/TR
 snarl's
 snarl/USDG
 snarling/Y
 snarly/TR
 snatch/ZGMDRS
 snatcher/M
 snazzily
-snazzy/TR
+snazzy/TRP
 sneak/SMDRZG
 sneaker/M
 sneakily
 sneakiness/M
 sneaking/Y
 sneaky/TRP
 sneer/SJMDG
 sneering/Y
@@ -47112,16 +47129,17 @@ subtly
 subtopic/SM
 subtotal/SGMD
 subtract/GSD
 subtraction/SM
 subtrahend/SM
 subtropic/S
 subtropical
 subtropics/M
+subtweet/S
 suburb/MS
 suburban/SM
 suburbanite/SM
 suburbia/M
 subvention/SM
 subversion/M
 subversive/SPMY
 subversiveness/M
@@ -49870,16 +49888,17 @@ tyrannic
 tyrannical/Y
 tyrannize/GDS
 tyrannosaur/MS
 tyrannosaurus/MS
 tyrannous
 tyranny/SM
 tyrant/SM
 tyro/MS
+tzatziki
 u/S
 ubiquitous/Y
 ubiquity/M
 udder/SM
 ufologist/SM
 ufology/M
 ugh
 ugliness/M
@@ -51560,16 +51579,17 @@ welfare/M
 welkin/M
 well/MDPSG
 wellhead/SM
 wellie
 wellington/MS
 wellness/M
 wellspring/MS
 welly/S
+welp
 welsh/ZGDRS
 welsher/M
 welt/MDRSZG
 welter/GMD
 welterweight/SM
 wen/M
 wench/MS
 wend/DSG
@@ -52099,16 +52119,17 @@ woolly/RSMPT
 woozily
 wooziness/M
 woozy/TRP
 wop/MS!
 word's
 word/ADSG
 wordage/M
 wordbook/SM
+wordie/S
 wordily
 wordiness/M
 wording/SM
 wordless/Y
 wordplay/M
 wordsmith
 wordsmiths
 wordy/TPR

--- a/layout/generic/nsGridContainerFrame.cpp
+++ b/layout/generic/nsGridContainerFrame.cpp
@@ -190,29 +190,30 @@ enum class GridLineSide
 struct nsGridContainerFrame::TrackSize
 {
   enum StateBits : uint16_t {
     eAutoMinSizing =              0x1,
     eMinContentMinSizing =        0x2,
     eMaxContentMinSizing =        0x4,
     eMinOrMaxContentMinSizing = eMinContentMinSizing | eMaxContentMinSizing,
     eIntrinsicMinSizing = eMinOrMaxContentMinSizing | eAutoMinSizing,
-    // 0x8 is unused, feel free to take it!
+    eModified =                   0x8,
     eAutoMaxSizing =             0x10,
     eMinContentMaxSizing =       0x20,
     eMaxContentMaxSizing =       0x40,
     eAutoOrMaxContentMaxSizing = eAutoMaxSizing | eMaxContentMaxSizing,
     eIntrinsicMaxSizing = eAutoOrMaxContentMaxSizing | eMinContentMaxSizing,
     eFlexMaxSizing =             0x80,
     eFrozen =                   0x100,
     eSkipGrowUnlimited1 =       0x200,
     eSkipGrowUnlimited2 =       0x400,
     eSkipGrowUnlimited = eSkipGrowUnlimited1 | eSkipGrowUnlimited2,
     eBreakBefore =              0x800,
     eFitContent =              0x1000,
+    eInfinitelyGrowable =      0x2000,
   };
 
   StateBits Initialize(nscoord aPercentageBasis,
                        const nsStyleCoord& aMinCoord,
                        const nsStyleCoord& aMaxCoord);
   bool IsFrozen() const { return mState & eFrozen; }
 #ifdef DEBUG
   void Dump() const;
@@ -1134,16 +1135,71 @@ struct nsGridContainerFrame::Tracks
                                nsTArray<GridItemInfo>& aGridItems);
 
   /**
    * Apply the additional alignment needed to align the baseline-aligned subtree
    * the item belongs to within its baseline track.
    */
   void AlignBaselineSubtree(const GridItemInfo& aGridItem) const;
 
+  enum class TrackSizingPhase
+  {
+    eIntrinsicMinimums,
+    eContentBasedMinimums,
+    eMaxContentMinimums,
+    eIntrinsicMaximums,
+    eMaxContentMaximums,
+  };
+
+  // Some data we collect on each item for Step 2 of the Track Sizing Algorithm
+  // in ResolveIntrinsicSize below.
+  struct Step2ItemData final
+  {
+    uint32_t mSpan;
+    TrackSize::StateBits mState;
+    LineRange mLineRange;
+    nscoord mMinSize;
+    nscoord mMinContentContribution;
+    nscoord mMaxContentContribution;
+    nsIFrame* mFrame;
+    static bool IsSpanLessThan(const Step2ItemData& a, const Step2ItemData& b)
+    {
+      return a.mSpan < b.mSpan;
+    }
+
+    template<TrackSizingPhase phase>
+    nscoord SizeContributionForPhase() const
+    {
+      switch (phase) {
+        case TrackSizingPhase::eIntrinsicMinimums:
+        case TrackSizingPhase::eIntrinsicMaximums:
+          return mMinSize;
+        case TrackSizingPhase::eContentBasedMinimums:
+          return mMinContentContribution;
+        case TrackSizingPhase::eMaxContentMinimums:
+        case TrackSizingPhase::eMaxContentMaximums:
+          return mMaxContentContribution;
+      }
+      MOZ_MAKE_COMPILER_ASSUME_IS_UNREACHABLE("Unexpected phase");
+    }
+  };
+
+  using FitContentClamper =
+    std::function<bool(uint32_t aTrack, nscoord aMinSize, nscoord* aSize)>;
+
+  // Helper method for ResolveIntrinsicSize.
+  template<TrackSizingPhase phase>
+  bool GrowSizeForSpanningItems(nsTArray<Step2ItemData>::iterator aIter,
+                                const nsTArray<Step2ItemData>::iterator aEnd,
+                                nsTArray<uint32_t>& aTracks,
+                                nsTArray<TrackSize>& aPlan,
+                                nsTArray<TrackSize>& aItemPlan,
+                                TrackSize::StateBits aSelector,
+                                const FitContentClamper& aClamper = nullptr,
+                                bool aNeedInfinitelyGrowableFlag = false);
   /**
    * Resolve Intrinsic Track Sizes.
    * http://dev.w3.org/csswg/css-grid/#algo-content
    */
   void ResolveIntrinsicSize(GridReflowInput&            aState,
                             nsTArray<GridItemInfo>&     aGridItems,
                             const TrackSizingFunctions& aFunctions,
                             LineRange GridArea::*       aRange,
@@ -1156,76 +1212,127 @@ struct nsGridContainerFrame::Tracks
    * max-sizing function, false otherwise.
    */
   bool ResolveIntrinsicSizeStep1(GridReflowInput&            aState,
                                  const TrackSizingFunctions& aFunctions,
                                  nscoord                     aPercentageBasis,
                                  SizingConstraint            aConstraint,
                                  const LineRange&            aRange,
                                  const GridItemInfo&         aGridItem);
+
+  // Helper method that returns the track size to use in §11.5.1.2
+  // https://drafts.csswg.org/css-grid/#extra-space
+  template<TrackSizingPhase phase> static
+  nscoord StartSizeInDistribution(const TrackSize& aSize)
+  {
+    switch (phase) {
+      case TrackSizingPhase::eIntrinsicMinimums:
+      case TrackSizingPhase::eContentBasedMinimums:
+      case TrackSizingPhase::eMaxContentMinimums:
+        return aSize.mBase;
+      case TrackSizingPhase::eIntrinsicMaximums:
+      case TrackSizingPhase::eMaxContentMaximums:
+        if (aSize.mLimit == NS_UNCONSTRAINEDSIZE) {
+          return aSize.mBase;
+        }
+        return aSize.mLimit;
+    }
+    MOZ_MAKE_COMPILER_ASSUME_IS_UNREACHABLE("Unexpected phase");
+  }
+
   /**
    * Collect the tracks which are growable (matching aSelector) into
    * aGrowableTracks, and return the amount of space that can be used
-   * to grow those tracks.  Specifically, we return aAvailableSpace minus
-   * the sum of mBase's (and corresponding grid gaps) in aPlan (clamped to 0)
-   * for the tracks in aRange, or zero when there are no growable tracks.
-   * @note aPlan[*].mBase represents a planned new base or limit.
+   * to grow those tracks.  This method implements CSS Grid §11.5.1.2.
+   * https://drafts.csswg.org/css-grid/#extra-space
    */
-  nscoord CollectGrowable(nscoord                    aAvailableSpace,
-                          const nsTArray<TrackSize>& aPlan,
-                          const LineRange&           aRange,
-                          TrackSize::StateBits       aSelector,
-                          nsTArray<uint32_t>&        aGrowableTracks) const
+  template<TrackSizingPhase phase>
+  nscoord CollectGrowable(nscoord              aAvailableSpace,
+                          const LineRange&     aRange,
+                          TrackSize::StateBits aSelector,
+                          nsTArray<uint32_t>&  aGrowableTracks) const
   {
     MOZ_ASSERT(aAvailableSpace > 0, "why call me?");
     nscoord space = aAvailableSpace - mGridGap * (aRange.Extent() - 1);
     const uint32_t start = aRange.mStart;
     const uint32_t end = aRange.mEnd;
     for (uint32_t i = start; i < end; ++i) {
-      const TrackSize& sz = aPlan[i];
-      space -= sz.mBase;
+      const TrackSize& sz = mSizes[i];
+      space -= StartSizeInDistribution<phase>(sz);
       if (space <= 0) {
         return 0;
       }
-      if ((sz.mState & aSelector) && !sz.IsFrozen()) {
+      if (sz.mState & aSelector) {
         aGrowableTracks.AppendElement(i);
       }
     }
     return aGrowableTracks.IsEmpty() ? 0 : space;
   }
 
-  void SetupGrowthPlan(nsTArray<TrackSize>&      aPlan,
-                       const nsTArray<uint32_t>& aTracks) const
-  {
-    for (uint32_t track : aTracks) {
-      aPlan[track] = mSizes[track];
-    }
-  }
-
-  void CopyPlanToBase(const nsTArray<TrackSize>& aPlan,
-                      const nsTArray<uint32_t>&  aTracks)
+  template<TrackSizingPhase phase>
+  void InitializeItemPlan(nsTArray<TrackSize>&      aItemPlan,
+                          const nsTArray<uint32_t>& aTracks) const
   {
     for (uint32_t track : aTracks) {
-      MOZ_ASSERT(mSizes[track].mBase <= aPlan[track].mBase);
-      mSizes[track].mBase = aPlan[track].mBase;
-    }
-  }
-
-  void CopyPlanToLimit(const nsTArray<TrackSize>& aPlan,
-                       const nsTArray<uint32_t>&  aTracks)
+      auto& plan = aItemPlan[track];
+      const TrackSize& sz = mSizes[track];
+      plan.mBase = StartSizeInDistribution<phase>(sz);
+      bool unlimited = sz.mState & TrackSize::eInfinitelyGrowable;
+      plan.mLimit = unlimited ? NS_UNCONSTRAINEDSIZE : sz.mLimit;
+      plan.mState = sz.mState;
+    }
+  }
+
+  template<TrackSizingPhase phase>
+  void InitializePlan(nsTArray<TrackSize>& aPlan) const
+  {
+    for (size_t i = 0, len = aPlan.Length(); i < len; ++i) {
+      auto& plan = aPlan[i];
+      const auto& sz = mSizes[i];
+      plan.mBase = StartSizeInDistribution<phase>(sz);
+      MOZ_ASSERT(phase == TrackSizingPhase::eMaxContentMaximums ||
+                 !(sz.mState & TrackSize::eInfinitelyGrowable),
+                 "forgot to reset the eInfinitelyGrowable bit?");
+      plan.mState = sz.mState;
+    }
+  }
+
+  template<TrackSizingPhase phase>
+  void CopyPlanToSize(const nsTArray<TrackSize>& aPlan,
+                      bool aNeedInfinitelyGrowableFlag = false)
   {
-    for (uint32_t track : aTracks) {
-      MOZ_ASSERT(mSizes[track].mLimit == NS_UNCONSTRAINEDSIZE ||
-                 mSizes[track].mLimit <= aPlan[track].mBase);
-      mSizes[track].mLimit = aPlan[track].mBase;
-    }
-  }
-
-  using FitContentClamper =
-    std::function<bool(uint32_t aTrack, nscoord aMinSize, nscoord* aSize)>;
+    for (size_t i = 0, len = mSizes.Length(); i < len; ++i) {
+      const auto& plan = aPlan[i];
+      MOZ_ASSERT(plan.mBase >= 0);
+      auto& sz = mSizes[i];
+      switch (phase) {
+        case TrackSizingPhase::eIntrinsicMinimums:
+        case TrackSizingPhase::eContentBasedMinimums:
+        case TrackSizingPhase::eMaxContentMinimums:
+          sz.mBase = plan.mBase;
+          break;
+        case TrackSizingPhase::eIntrinsicMaximums:
+          if (plan.mState & TrackSize::eModified) {
+            if (sz.mLimit == NS_UNCONSTRAINEDSIZE &&
+                aNeedInfinitelyGrowableFlag) {
+              sz.mState |= TrackSize::eInfinitelyGrowable;
+            }
+            sz.mLimit = plan.mBase;
+          }
+          break;
+        case TrackSizingPhase::eMaxContentMaximums:
+          if (plan.mState & TrackSize::eModified) {
+            sz.mLimit = plan.mBase;
+          }
+          sz.mState &= ~TrackSize::eInfinitelyGrowable;
+          break;
+      }
+    }
+  }
+
   /**
    * Grow the planned size for tracks in aGrowableTracks up to their limit
    * and then freeze them (all aGrowableTracks must be unfrozen on entry).
    * Subtract the space added from aAvailableSpace and return that.
    */
   nscoord GrowTracksToLimit(nscoord                   aAvailableSpace,
                             nsTArray<TrackSize>&      aPlan,
                             const nsTArray<uint32_t>& aGrowableTracks,
@@ -1275,22 +1382,23 @@ struct nsGridContainerFrame::Tracks
   /**
    * Helper for GrowSelectedTracksUnlimited.  For the set of tracks (S) that
    * match aMinSizingSelector: if a track in S doesn't match aMaxSizingSelector
    * then mark it with aSkipFlag.  If all tracks in S were marked then unmark
    * them.  Return aNumGrowable minus the number of tracks marked.  It is
    * assumed that aPlan have no aSkipFlag set for tracks in aGrowableTracks
    * on entry to this method.
    */
-   uint32_t MarkExcludedTracks(nsTArray<TrackSize>&      aPlan,
-                               uint32_t                  aNumGrowable,
-                               const nsTArray<uint32_t>& aGrowableTracks,
-                               TrackSize::StateBits      aMinSizingSelector,
-                               TrackSize::StateBits      aMaxSizingSelector,
-                               TrackSize::StateBits      aSkipFlag) const
+   static uint32_t
+   MarkExcludedTracks(nsTArray<TrackSize>&      aPlan,
+                      uint32_t                  aNumGrowable,
+                      const nsTArray<uint32_t>& aGrowableTracks,
+                      TrackSize::StateBits      aMinSizingSelector,
+                      TrackSize::StateBits      aMaxSizingSelector,
+                      TrackSize::StateBits      aSkipFlag)
   {
     bool foundOneSelected = false;
     bool foundOneGrowable = false;
     uint32_t numGrowable = aNumGrowable;
     for (uint32_t track : aGrowableTracks) {
       TrackSize& sz = aPlan[track];
       const auto state = sz.mState;
       if (state & aMinSizingSelector) {
@@ -1310,67 +1418,86 @@ struct nsGridContainerFrame::Tracks
         aPlan[track].mState &= ~aSkipFlag;
       }
       numGrowable = aNumGrowable;
     }
     return numGrowable;
   }
 
   /**
-   * Increase the planned size for tracks in aGrowableTracks that match
-   * aSelector (or all tracks if aSelector is zero) beyond their limit.
+   * Mark all tracks in aGrowableTracks with an eSkipGrowUnlimited bit if
+   * they *shouldn't* grow unlimited in §11.5.1.2.3 "Distribute space beyond
+   * growth limits" https://drafts.csswg.org/css-grid/#extra-space
+   * Return the number of tracks that are still growable.
+   */
+  template<TrackSizingPhase phase>
+  static uint32_t
+  MarkExcludedTracks(nsTArray<TrackSize>&      aPlan,
+                     const nsTArray<uint32_t>& aGrowableTracks,
+                     TrackSize::StateBits      aSelector)
+  {
+    uint32_t numGrowable = aGrowableTracks.Length();
+    if (phase == TrackSizingPhase::eIntrinsicMaximums ||
+        phase == TrackSizingPhase::eMaxContentMaximums) {
+      // "when handling any intrinsic growth limit: all affected tracks"
+      return numGrowable;
+    }
+    MOZ_ASSERT(aSelector == (aSelector & TrackSize::eIntrinsicMinSizing) &&
+                            (aSelector & TrackSize::eMaxContentMinSizing),
+               "Should only get here for track sizing steps 2.1 to 2.3");
+    // Note that eMaxContentMinSizing is always included. We do those first:
+    numGrowable = MarkExcludedTracks(aPlan, numGrowable, aGrowableTracks,
+                                     TrackSize::eMaxContentMinSizing,
+                                     TrackSize::eMaxContentMaxSizing,
+                                     TrackSize::eSkipGrowUnlimited1);
+    // Now mark min-content/auto min-sizing tracks if requested.
+    auto minOrAutoSelector = aSelector & ~TrackSize::eMaxContentMinSizing;
+    if (minOrAutoSelector) {
+      numGrowable = MarkExcludedTracks(aPlan, numGrowable, aGrowableTracks,
+                                       minOrAutoSelector,
+                                       TrackSize::eIntrinsicMaxSizing,
+                                       TrackSize::eSkipGrowUnlimited2);
+    }
+    return numGrowable;
+  }
+
+  /**
+   * Increase the planned size for tracks in aGrowableTracks that aren't
+   * marked with a eSkipGrowUnlimited flag beyond their limit.
    * This implements the "Distribute space beyond growth limits" step in
    * https://drafts.csswg.org/css-grid/#distribute-extra-space
    */
   void GrowSelectedTracksUnlimited(nscoord                   aAvailableSpace,
                                    nsTArray<TrackSize>&      aPlan,
                                    const nsTArray<uint32_t>& aGrowableTracks,
-                                   TrackSize::StateBits      aSelector,
+                                   uint32_t                  aNumGrowable,
                                    const FitContentClamper&  aFitContentClamper) const
   {
-    MOZ_ASSERT(aAvailableSpace > 0 && aGrowableTracks.Length() > 0);
-    uint32_t numGrowable = aGrowableTracks.Length();
-    if (aSelector) {
-      MOZ_ASSERT(aSelector == (aSelector & TrackSize::eIntrinsicMinSizing) &&
-                 (aSelector & TrackSize::eMaxContentMinSizing),
-                 "Should only get here for track sizing steps 2.1 to 2.3");
-      // Note that eMaxContentMinSizing is always included. We do those first:
-      numGrowable = MarkExcludedTracks(aPlan, numGrowable, aGrowableTracks,
-                                       TrackSize::eMaxContentMinSizing,
-                                       TrackSize::eMaxContentMaxSizing,
-                                       TrackSize::eSkipGrowUnlimited1);
-      // Now mark min-content/auto min-sizing tracks if requested.
-      auto minOrAutoSelector = aSelector & ~TrackSize::eMaxContentMinSizing;
-      if (minOrAutoSelector) {
-        numGrowable = MarkExcludedTracks(aPlan, numGrowable, aGrowableTracks,
-                                         minOrAutoSelector,
-                                         TrackSize::eIntrinsicMaxSizing,
-                                         TrackSize::eSkipGrowUnlimited2);
-      }
-    }
+    MOZ_ASSERT(aAvailableSpace > 0 && aGrowableTracks.Length() > 0 &&
+               aNumGrowable <= aGrowableTracks.Length());
     nscoord space = aAvailableSpace;
     DebugOnly<bool> didClamp = false;
-    while (numGrowable) {
-      nscoord spacePerTrack = std::max<nscoord>(space / numGrowable, 1);
+    while (aNumGrowable) {
+      nscoord spacePerTrack = std::max<nscoord>(space / aNumGrowable, 1);
       for (uint32_t track : aGrowableTracks) {
         TrackSize& sz = aPlan[track];
         if (sz.mState & TrackSize::eSkipGrowUnlimited) {
           continue; // an excluded track
         }
         nscoord delta = spacePerTrack;
         nscoord newBase = sz.mBase + delta;
         if (MOZ_UNLIKELY((sz.mState & TrackSize::eFitContent) &&
                          aFitContentClamper)) {
           // Clamp newBase to the fit-content() size, for §12.5.2 step 5/6.
           if (aFitContentClamper(track, sz.mBase, &newBase)) {
             didClamp = true;
             delta = newBase - sz.mBase;
             MOZ_ASSERT(delta >= 0, "track size shouldn't shrink");
             sz.mState |= TrackSize::eSkipGrowUnlimited1;
-            --numGrowable;
+            --aNumGrowable;
           }
         }
         sz.mBase = newBase;
         space -= delta;
         MOZ_ASSERT(space >= 0);
         if (space == 0) {
           return;
         }
@@ -1379,56 +1506,40 @@ struct nsGridContainerFrame::Tracks
     MOZ_ASSERT(didClamp, "we don't exit the loop above except by return, "
                          "unless we clamped some track's size");
   }
 
   /**
    * Distribute aAvailableSpace to the planned base size for aGrowableTracks
    * up to their limits, then distribute the remaining space beyond the limits.
    */
-  void DistributeToTrackBases(nscoord              aAvailableSpace,
+  template<TrackSizingPhase phase>
+  void DistributeToTrackSizes(nscoord              aAvailableSpace,
                               nsTArray<TrackSize>& aPlan,
+                              nsTArray<TrackSize>& aItemPlan,
                               nsTArray<uint32_t>&  aGrowableTracks,
-                              TrackSize::StateBits aSelector)
+                              TrackSize::StateBits aSelector,
+                              const FitContentClamper& aFitContentClamper)
   {
-    SetupGrowthPlan(aPlan, aGrowableTracks);
-    nscoord space = GrowTracksToLimit(aAvailableSpace, aPlan, aGrowableTracks, nullptr);
+    InitializeItemPlan<phase>(aItemPlan, aGrowableTracks);
+    nscoord space = GrowTracksToLimit(aAvailableSpace, aItemPlan, aGrowableTracks,
+                                      aFitContentClamper);
     if (space > 0) {
-      GrowSelectedTracksUnlimited(space, aPlan, aGrowableTracks, aSelector, nullptr);
-    }
-    CopyPlanToBase(aPlan, aGrowableTracks);
-  }
-
-  /**
-   * Distribute aAvailableSpace to the planned limits for aGrowableTracks.
-   */
-  void DistributeToTrackLimits(nscoord              aAvailableSpace,
-                               nsTArray<TrackSize>& aPlan,
-                               nsTArray<uint32_t>&  aGrowableTracks,
-                               const TrackSizingFunctions& aFunctions,
-                               nscoord                     aPercentageBasis)
-  {
-    auto fitContentClamper = [&aFunctions, aPercentageBasis] (uint32_t aTrack,
-                                                              nscoord aMinSize,
-                                                              nscoord* aSize) {
-      nscoord fitContentLimit =
-        ::ResolveToDefiniteSize(aFunctions.MaxSizingFor(aTrack), aPercentageBasis);
-      if (*aSize > fitContentLimit) {
-        *aSize = std::max(aMinSize, fitContentLimit);
-        return true;
-      }
-      return false;
-    };
-    nscoord space = GrowTracksToLimit(aAvailableSpace, aPlan, aGrowableTracks,
-                                      fitContentClamper);
-    if (space > 0) {
-      GrowSelectedTracksUnlimited(aAvailableSpace, aPlan, aGrowableTracks,
-                                  TrackSize::StateBits(0), fitContentClamper);
-    }
-    CopyPlanToLimit(aPlan, aGrowableTracks);
+      uint32_t numGrowable =
+        MarkExcludedTracks<phase>(aItemPlan, aGrowableTracks, aSelector);
+      GrowSelectedTracksUnlimited(space, aItemPlan, aGrowableTracks,
+                                  numGrowable, aFitContentClamper);
+    }
+    for (uint32_t track : aGrowableTracks) {
+      nscoord& plannedSize = aPlan[track].mBase;
+      nscoord itemIncurredSize = aItemPlan[track].mBase;
+      if (plannedSize < itemIncurredSize) {
+        plannedSize = itemIncurredSize;
+      }
+    }
   }
 
   /**
    * Distribute aAvailableSize to the tracks.  This implements 12.6 at:
    * http://dev.w3.org/csswg/css-grid/#algo-grow-tracks
    */
   void DistributeFreeSpace(nscoord aAvailableSize)
   {
@@ -4131,41 +4242,74 @@ nsGridContainerFrame::Tracks::AlignBasel
     case NS_STYLE_ALIGN_CENTER:
       aGridItem.mBaselineOffset[mAxis] += delta / 2;
       break;
     default:
       MOZ_ASSERT_UNREACHABLE("unexpected baseline subtree alignment");
   }
 }
 
+template<nsGridContainerFrame::Tracks::TrackSizingPhase phase>
+bool
+nsGridContainerFrame::Tracks::GrowSizeForSpanningItems(
+  nsTArray<Step2ItemData>::iterator aIter,
+  const nsTArray<Step2ItemData>::iterator aIterEnd,
+  nsTArray<uint32_t>& aTracks,
+  nsTArray<TrackSize>& aPlan,
+  nsTArray<TrackSize>& aItemPlan,
+  TrackSize::StateBits aSelector,
+  const FitContentClamper& aFitContentClamper,
+  bool aNeedInfinitelyGrowableFlag)
+{
+  constexpr bool isMaxSizingPhase =
+    phase == TrackSizingPhase::eIntrinsicMaximums ||
+    phase == TrackSizingPhase::eMaxContentMaximums;
+  bool needToUpdateSizes = false;
+  InitializePlan<phase>(aPlan);
+  for (; aIter != aIterEnd; ++aIter) {
+    const Step2ItemData& item = *aIter;
+    if (!(item.mState & aSelector)) {
+      continue;
+    }
+    if (isMaxSizingPhase) {
+      for (auto j = item.mLineRange.mStart, end = item.mLineRange.mEnd; j < end; ++j) {
+        aPlan[j].mState |= TrackSize::eModified;
+      }
+    }
+    nscoord space = item.SizeContributionForPhase<phase>();
+    if (space <= 0) {
+      continue;
+    }
+    aTracks.ClearAndRetainStorage();
+    space = CollectGrowable<phase>(space, item.mLineRange, aSelector,
+                                   aTracks);
+    if (space > 0) {
+      DistributeToTrackSizes<phase>(space, aPlan, aItemPlan, aTracks, aSelector,
+                                    aFitContentClamper);
+      needToUpdateSizes = true;
+    }
+  }
+  if (isMaxSizingPhase) {
+    needToUpdateSizes = true;
+  }
+  if (needToUpdateSizes) {
+    CopyPlanToSize<phase>(aPlan, aNeedInfinitelyGrowableFlag);
+  }
+  return needToUpdateSizes;
+}
+
 void
 nsGridContainerFrame::Tracks::ResolveIntrinsicSize(
   GridReflowInput&            aState,
   nsTArray<GridItemInfo>&     aGridItems,
   const TrackSizingFunctions& aFunctions,
   LineRange GridArea::*       aRange,
   nscoord                     aPercentageBasis,
   SizingConstraint            aConstraint)
 {
-  // Some data we collect on each item for Step 2 of the algorithm below.
-  struct Step2ItemData
-  {
-    uint32_t mSpan;
-    TrackSize::StateBits mState;
-    LineRange mLineRange;
-    nscoord mMinSize;
-    nscoord mMinContentContribution;
-    nscoord mMaxContentContribution;
-    nsIFrame* mFrame;
-    static bool IsSpanLessThan(const Step2ItemData& a, const Step2ItemData& b)
-    {
-      return a.mSpan < b.mSpan;
-    }
-  };
-
   // Resolve Intrinsic Track Sizes
   // http://dev.w3.org/csswg/css-grid/#algo-content
   // We're also setting eIsFlexing on the item state here to speed up
   // FindUsedFlexFraction later.
   AutoTArray<TrackSize::StateBits, 16> stateBitsPerSpan;
   nsTArray<Step2ItemData> step2Items;
   CSSOrderAwareFrameIterator& iter = aState.mIter;
   gfxContext* rc = &aState.mRenderingContext;
@@ -4265,169 +4409,100 @@ nsGridContainerFrame::Tracks::ResolveInt
     }
     MOZ_ASSERT(!(gridItem.mState[mAxis] & ItemState::eClampMarginBoxMinSize) ||
                (gridItem.mState[mAxis] & ItemState::eApplyAutoMinSize),
                "clamping only applies to Automatic Minimum Size");
   }
 
   // Step 2.
   if (maxSpan) {
+    auto fitContentClamper = [&aFunctions, aPercentageBasis] (uint32_t aTrack,
+                                                              nscoord aMinSize,
+                                                              nscoord* aSize)
+    {
+      nscoord fitContentLimit =
+        ::ResolveToDefiniteSize(aFunctions.MaxSizingFor(aTrack), aPercentageBasis);
+      if (*aSize > fitContentLimit) {
+        *aSize = std::max(aMinSize, fitContentLimit);
+        return true;
+      }
+      return false;
+    };
+
     // Sort the collected items on span length, shortest first.
     std::stable_sort(step2Items.begin(), step2Items.end(),
                      Step2ItemData::IsSpanLessThan);
 
     nsTArray<uint32_t> tracks(maxSpan);
     nsTArray<TrackSize> plan(mSizes.Length());
     plan.SetLength(mSizes.Length());
-    for (uint32_t i = 0, len = step2Items.Length(); i < len; ) {
-      // Start / end index for items of the same span length:
-      const uint32_t spanGroupStartIndex = i;
-      uint32_t spanGroupEndIndex = len;
-      const uint32_t span = step2Items[i].mSpan;
-      for (++i; i < len; ++i) {
-        if (step2Items[i].mSpan != span) {
-          spanGroupEndIndex = i;
-          break;
-        }
-      }
-
+    nsTArray<TrackSize> itemPlan(mSizes.Length());
+    itemPlan.SetLength(mSizes.Length());
+    // Start / end iterator for items of the same span length:
+    auto spanGroupStart = step2Items.begin();
+    auto spanGroupEnd = spanGroupStart;
+    const auto end = step2Items.end();
+    for (; spanGroupStart != end; spanGroupStart = spanGroupEnd) {
+      while (spanGroupEnd != end &&
+             !Step2ItemData::IsSpanLessThan(*spanGroupStart, *spanGroupEnd)) {
+        ++spanGroupEnd;
+      }
+
+      const uint32_t span = spanGroupStart->mSpan;
       bool updatedBase = false; // Did we update any mBase in step 2.1 - 2.3?
       TrackSize::StateBits selector(TrackSize::eIntrinsicMinSizing);
       if (stateBitsPerSpan[span] & selector) {
         // Step 2.1 MinSize to intrinsic min-sizing.
-        for (i = spanGroupStartIndex; i < spanGroupEndIndex; ++i) {
-          Step2ItemData& item = step2Items[i];
-          if (!(item.mState & selector)) {
-            continue;
-          }
-          nscoord space = item.mMinSize;
-          if (space <= 0) {
-            continue;
-          }
-          tracks.ClearAndRetainStorage();
-          space = CollectGrowable(space, mSizes, item.mLineRange, selector,
-                                  tracks);
-          if (space > 0) {
-            DistributeToTrackBases(space, plan, tracks, selector);
-            updatedBase = true;
-          }
-        }
+        updatedBase =
+          GrowSizeForSpanningItems<TrackSizingPhase::eIntrinsicMinimums>(
+            spanGroupStart, spanGroupEnd, tracks, plan, itemPlan, selector);
       }
 
       selector = contentBasedMinSelector;
       if (stateBitsPerSpan[span] & selector) {
         // Step 2.2 MinContentContribution to min-/max-content (and 'auto' when
         // sizing under a min-content constraint) min-sizing.
-        for (i = spanGroupStartIndex; i < spanGroupEndIndex; ++i) {
-          Step2ItemData& item = step2Items[i];
-          if (!(item.mState & selector)) {
-            continue;
-          }
-          nscoord space = item.mMinContentContribution;
-          if (space <= 0) {
-            continue;
-          }
-          tracks.ClearAndRetainStorage();
-          space = CollectGrowable(space, mSizes, item.mLineRange, selector,
-                                  tracks);
-          if (space > 0) {
-            DistributeToTrackBases(space, plan, tracks, selector);
-            updatedBase = true;
-          }
-        }
+        updatedBase |=
+          GrowSizeForSpanningItems<TrackSizingPhase::eContentBasedMinimums>(
+            spanGroupStart, spanGroupEnd, tracks, plan, itemPlan, selector);
       }
 
       selector = maxContentMinSelector;
       if (stateBitsPerSpan[span] & selector) {
         // Step 2.3 MaxContentContribution to max-content (and 'auto' when
         // sizing under a max-content constraint) min-sizing.
-        for (i = spanGroupStartIndex; i < spanGroupEndIndex; ++i) {
-          Step2ItemData& item = step2Items[i];
-          if (!(item.mState & selector)) {
-            continue;
-          }
-          nscoord space = item.mMaxContentContribution;
-          if (space <= 0) {
-            continue;
-          }
-          tracks.ClearAndRetainStorage();
-          space = CollectGrowable(space, mSizes, item.mLineRange, selector,
-                                  tracks);
-          if (space > 0) {
-            DistributeToTrackBases(space, plan, tracks, selector);
-            updatedBase = true;
-          }
-        }
+        updatedBase |=
+          GrowSizeForSpanningItems<TrackSizingPhase::eMaxContentMinimums>(
+            spanGroupStart, spanGroupEnd, tracks, plan, itemPlan, selector);
       }
 
       if (updatedBase) {
         // Step 2.4
         for (TrackSize& sz : mSizes) {
           if (sz.mBase > sz.mLimit) {
             sz.mLimit = sz.mBase;
           }
         }
       }
-      if (stateBitsPerSpan[span] & TrackSize::eIntrinsicMaxSizing) {
-        plan = mSizes;
-        for (TrackSize& sz : plan) {
-          if (sz.mLimit == NS_UNCONSTRAINEDSIZE) {
-            // use mBase as the planned limit
-          } else {
-            sz.mBase = sz.mLimit;
-          }
-        }
-
+
+      selector = TrackSize::eIntrinsicMaxSizing;
+      if (stateBitsPerSpan[span] & selector) {
+        const bool willRunStep2_6 =
+          stateBitsPerSpan[span] & TrackSize::eAutoOrMaxContentMaxSizing;
         // Step 2.5 MinSize to intrinsic max-sizing.
-        for (i = spanGroupStartIndex; i < spanGroupEndIndex; ++i) {
-          Step2ItemData& item = step2Items[i];
-          if (!(item.mState & TrackSize::eIntrinsicMaxSizing)) {
-            continue;
-          }
-          nscoord space = item.mMinSize;
-          if (space <= 0) {
-            continue;
-          }
-          tracks.ClearAndRetainStorage();
-          space = CollectGrowable(space, plan, item.mLineRange,
-                                  TrackSize::eIntrinsicMaxSizing,
-                                  tracks);
-          if (space > 0) {
-            DistributeToTrackLimits(space, plan, tracks, aFunctions,
-                                    aPercentageBasis);
-          }
-        }
-        for (size_t j = 0, len = mSizes.Length(); j < len; ++j) {
-          TrackSize& sz = plan[j];
-          sz.mState &= ~(TrackSize::eFrozen | TrackSize::eSkipGrowUnlimited);
-          if (sz.mLimit != NS_UNCONSTRAINEDSIZE) {
-            sz.mLimit = sz.mBase;  // collect the results from 2.5
-          }
-        }
-
-        if (stateBitsPerSpan[span] & TrackSize::eAutoOrMaxContentMaxSizing) {
+        GrowSizeForSpanningItems<TrackSizingPhase::eIntrinsicMaximums>(
+          spanGroupStart, spanGroupEnd, tracks, plan, itemPlan, selector,
+          fitContentClamper, willRunStep2_6);
+
+        if (willRunStep2_6) {
           // Step 2.6 MaxContentContribution to max-content max-sizing.
-          for (i = spanGroupStartIndex; i < spanGroupEndIndex; ++i) {
-            Step2ItemData& item = step2Items[i];
-            if (!(item.mState & TrackSize::eAutoOrMaxContentMaxSizing)) {
-              continue;
-            }
-            nscoord space = item.mMaxContentContribution;
-            if (space <= 0) {
-              continue;
-            }
-            tracks.ClearAndRetainStorage();
-            space = CollectGrowable(space, plan, item.mLineRange,
-                                    TrackSize::eAutoOrMaxContentMaxSizing,
-                                    tracks);
-            if (space > 0) {
-              DistributeToTrackLimits(space, plan, tracks, aFunctions,
-                                      aPercentageBasis);
-            }
-          }
+          selector = TrackSize::eAutoOrMaxContentMaxSizing;
+          GrowSizeForSpanningItems<TrackSizingPhase::eMaxContentMaximums>(
+            spanGroupStart, spanGroupEnd, tracks, plan, itemPlan, selector,
+            fitContentClamper);
         }
       }
     }
   }
 
   // Step 3.
   for (TrackSize& sz : mSizes) {
     if (sz.mLimit == NS_UNCONSTRAINEDSIZE) {
@@ -6939,16 +7014,19 @@ nsGridContainerFrame::TrackSize::Dump() 
     printf("max-content ");
   } else if (mState & eFlexMaxSizing) {
     printf("flex ");
   }
 
   if (mState & eFrozen) {
     printf("frozen ");
   }
+  if (mState & eModified) {
+    printf("modified ");
+  }
   if (mState & eBreakBefore) {
     printf("break-before ");
   }
 }
 
 #endif // DEBUG
 
 nsGridContainerFrame*

--- a/layout/generic/test/mochitest.ini
+++ b/layout/generic/test/mochitest.ini
@@ -137,8 +137,12 @@ support-files = selection_expanding_xbl.
 [test_selection_touchevents.html]
 [test_taintedfilters.html]
 support-files = file_taintedfilters_feDisplacementMap-tainted-1.svg file_taintedfilters_feDisplacementMap-tainted-2.svg file_taintedfilters_feDisplacementMap-tainted-3.svg file_taintedfilters_feDisplacementMap-tainted-ref.svg file_taintedfilters_feDisplacementMap-untainted-ref.svg file_taintedfilters_feDisplacementMap-untainted-1.svg file_taintedfilters_feDisplacementMap-untainted-2.svg file_taintedfilters_red-flood-for-feImage-cors.svg file_taintedfilters_red-flood-for-feImage-cors.svg^headers^ file_taintedfilters_red-flood-for-feImage.svg
 [test_scroll_position_restore.html]
 support-files = file_scroll_position_restore.html
 [test_scroll_position_restore_after_stop.html]
 [test_scroll_animation_restore.html]
 [test_scroll_position_iframe.html]
+[test_grid_track_sizing_algo_001.html]
+skip-if = debug == true # the test is slow
+[test_grid_track_sizing_algo_002.html]
+skip-if = debug == true # the test is slow

new file mode 100644
--- /dev/null
+++ b/layout/generic/test/test_grid_track_sizing_algo_001.html
@@ -0,0 +1,1641 @@
+<!DOCTYPE HTML>
+<!--
+     Any copyright is dedicated to the Public Domain.
+     http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<html><head>
+  <meta charset="utf-8">
+  <title>CSS Grid Test: intrinsic track sizing with spanning items</title>
+  <link rel="author" title="Mats Palmgren" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1425599">
+  <link rel="help" href="https://drafts.csswg.org/css-grid/#algo-content">
+  <script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>        
+  <style type="text/css">
+body,html { color:black; background:white; font-family:monospace; font-size:16px; padding:0; margin:0; }
+* { vertical-align: top; line-height: 1px; }
+
+.grid {
+  display: inline-grid;
+  grid-template-rows: 1px;
+  grid-auto-rows: 10px;
+  border: 1px solid;
+  place-content: start;
+  place-items: start;
+}
+
+x {
+  grid-row: 1;
+  height: 1px;
+  background: grey;
+}
+
+x:nth-child(1) { background: lime; width: 3px; grid-column: 1/span 2; }
+x:nth-child(2) { background: silver; width: 6px; grid-column: 2/span 4; }
+x:nth-child(3) { background: blue; width: 12px; grid-column: 2/span 2; }
+  </style>
+</head>
+<body>
+
+<script>
+let min1 = [
+  "0", "4px"
+];
+let min2 = [
+  "auto", "min-content", "max-content"
+];
+let max1 = [
+  "8px"
+];
+let max2 = [
+  "auto", "min-content", "max-content"
+];
+
+var track = [];
+min1.forEach((min) => { max2.forEach((max) => {
+  track.push("minmax(" + min + "," + max + ")");
+})});
+min2.forEach((min) => { max2.forEach((max) => {
+  track.push("minmax(" + min + "," + max + ")");
+})});
+min2.forEach((min) => { max1.forEach((max) => {
+  track.push("minmax(" + min + "," + max + ")");
+})});
+min2.forEach((min) => { max2.forEach((max) => {
+  track.push("minmax(" + min + "," + max + ")");
+})});
+track.push("fit-content(8px)");
+
+var cols = [];
+track.forEach((c1) =>  {
+  cols.push(c1 + " " + c1 + " " + c1 + " " + c1 + " " + c1);
+  track.forEach((c2) => {
+    if (c1 != c2) {
+      cols.push(c1 + " " + c2 + " " + c2 + " " + c2 + " " + c2);
+      cols.push(c2 + " " + c1 + " " + c1 + " " + c2 + " " + c2);
+    }
+})});
+
+document.body.style.display = 'none';
+cols.forEach((col) => {
+  let grid = document.createElement('div');
+  grid.className = "grid";
+  grid.style.gridTemplateColumns = col;
+  grid.appendChild(document.createElement('x'))
+  grid.appendChild(document.createElement('x'))
+  grid.appendChild(document.createElement('x'))
+  document.body.appendChild(grid);
+});
+document.body.style.display = '';
+</script>
+
+<script>
+var actual = [];
+[...document.querySelectorAll('.grid')].forEach(function(e) {
+  let cs = window.getComputedStyle(e);
+  actual.push([cs.gridTemplateColumns, cs.width]);
+});
+
+function dumpResult() {
+  var s = "";
+  actual.forEach(v => {
+    s += '["' + v[0] + '","' + v[1] + '"],\n';
+  });
+  let pre = document.createElement("pre");
+  pre.innerHTML = s;
+  document.body.appendChild(pre);
+}
+
+let expected = [
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["0px 6px 6px 4px 4px","20px"],
+["4px 6px 6px 4px 4px","24px"],
+["0px 6px 6px 4px 4px","20px"],
+["4px 6px 6px 4px 4px","24px"],
+["0px 6px 6px 4px 4px","20px"],
+["4px 6px 6px 4px 4px","24px"],
+["0px 6px 6px 0px 0px","12px"],
+["3px 6px 6px 3px 3px","21px"],
+["0px 6px 6px 0px 0px","12px"],
+["3px 6px 6px 3px 3px","21px"],
+["0px 6px 6px 0px 0px","12px"],
+["3px 6px 6px 3px 3px","21px"],
+["0px 6px 6px 0px 0px","12px"],
+["3px 6px 6px 3px 3px","21px"],
+["0px 6px 6px 0px 0px","12px"],
+["3px 6px 6px 3px 3px","21px"],
+["0px 6px 6px 0px 0px","12px"],
+["3px 6px 6px 3px 3px","21px"],
+["0px 6px 6px 0px 0px","12px"],
+["3px 6px 6px 3px 3px","21px"],
+["0px 6px 6px 0px 0px","12px"],
+["3px 6px 6px 3px 3px","21px"],
+["0px 6px 6px 0px 0px","12px"],
+["3px 6px 6px 3px 3px","21px"],
+["0px 8px 8px 8px 8px","32px"],
+["8px 6px 6px 8px 8px","36px"],
+["0px 8px 8px 8px 8px","32px"],
+["8px 6px 6px 8px 8px","36px"],
+["0px 8px 8px 8px 8px","32px"],
+["8px 6px 6px 8px 8px","36px"],
+["0px 6px 6px 0px 0px","12px"],
+["3px 6px 6px 3px 3px","21px"],
+["0px 6px 6px 0px 0px","12px"],
+["3px 6px 6px 3px 3px","21px"],
+["0px 6px 6px 0px 0px","12px"],
+["3px 6px 6px 3px 3px","21px"],
+["0px 6px 6px 0px 0px","12px"],
+["3px 6px 6px 3px 3px","21px"],
+["0px 6px 6px 0px 0px","12px"],
+["3px 6px 6px 3px 3px","21px"],
+["0px 6px 6px 0px 0px","12px"],
+["3px 6px 6px 3px 3px","21px"],
+["0px 6px 6px 0px 0px","12px"],
+["3px 6px 6px 3px 3px","21px"],
+["0px 6px 6px 0px 0px","12px"],
+["3px 6px 6px 3px 3px","21px"],
+["0px 6px 6px 0px 0px","12px"],
+["3px 6px 6px 3px 3px","21px"],
+["0px 6px 6px 0px 0px","12px"],
+["3px 6px 6px 3px 3px","21px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["0px 6px 6px 4px 4px","20px"],
+["4px 6px 6px 4px 4px","24px"],
+["0px 6px 6px 4px 4px","20px"],
+["4px 6px 6px 4px 4px","24px"],
+["0px 6px 6px 4px 4px","20px"],
+["4px 6px 6px 4px 4px","24px"],
+["0px 6px 6px 0px 0px","12px"],
+["3px 6px 6px 3px 3px","21px"],
+["0px 6px 6px 0px 0px","12px"],
+["3px 6px 6px 3px 3px","21px"],
+["0px 6px 6px 0px 0px","12px"],
+["3px 6px 6px 3px 3px","21px"],
+["0px 6px 6px 0px 0px","12px"],
+["3px 6px 6px 3px 3px","21px"],
+["0px 6px 6px 0px 0px","12px"],
+["3px 6px 6px 3px 3px","21px"],
+["0px 6px 6px 0px 0px","12px"],
+["3px 6px 6px 3px 3px","21px"],
+["0px 6px 6px 0px 0px","12px"],
+["3px 6px 6px 3px 3px","21px"],
+["0px 6px 6px 0px 0px","12px"],
+["3px 6px 6px 3px 3px","21px"],
+["0px 6px 6px 0px 0px","12px"],
+["3px 6px 6px 3px 3px","21px"],
+["0px 8px 8px 8px 8px","32px"],
+["8px 6px 6px 8px 8px","36px"],
+["0px 8px 8px 8px 8px","32px"],
+["8px 6px 6px 8px 8px","36px"],
+["0px 8px 8px 8px 8px","32px"],
+["8px 6px 6px 8px 8px","36px"],
+["0px 6px 6px 0px 0px","12px"],
+["3px 6px 6px 3px 3px","21px"],
+["0px 6px 6px 0px 0px","12px"],
+["3px 6px 6px 3px 3px","21px"],
+["0px 6px 6px 0px 0px","12px"],
+["3px 6px 6px 3px 3px","21px"],
+["0px 6px 6px 0px 0px","12px"],
+["3px 6px 6px 3px 3px","21px"],
+["0px 6px 6px 0px 0px","12px"],
+["3px 6px 6px 3px 3px","21px"],
+["0px 6px 6px 0px 0px","12px"],
+["3px 6px 6px 3px 3px","21px"],
+["0px 6px 6px 0px 0px","12px"],
+["3px 6px 6px 3px 3px","21px"],
+["0px 6px 6px 0px 0px","12px"],
+["3px 6px 6px 3px 3px","21px"],
+["0px 6px 6px 0px 0px","12px"],
+["3px 6px 6px 3px 3px","21px"],
+["0px 6px 6px 0px 0px","12px"],
+["3px 6px 6px 3px 3px","21px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["0px 6px 6px 4px 4px","20px"],
+["4px 6px 6px 4px 4px","24px"],
+["0px 6px 6px 4px 4px","20px"],
+["4px 6px 6px 4px 4px","24px"],
+["0px 6px 6px 4px 4px","20px"],
+["4px 6px 6px 4px 4px","24px"],
+["0px 6px 6px 0px 0px","12px"],
+["3px 6px 6px 3px 3px","21px"],
+["0px 6px 6px 0px 0px","12px"],
+["3px 6px 6px 3px 3px","21px"],
+["0px 6px 6px 0px 0px","12px"],
+["3px 6px 6px 3px 3px","21px"],
+["0px 6px 6px 0px 0px","12px"],
+["3px 6px 6px 3px 3px","21px"],
+["0px 6px 6px 0px 0px","12px"],
+["3px 6px 6px 3px 3px","21px"],
+["0px 6px 6px 0px 0px","12px"],
+["3px 6px 6px 3px 3px","21px"],
+["0px 6px 6px 0px 0px","12px"],
+["3px 6px 6px 3px 3px","21px"],
+["0px 6px 6px 0px 0px","12px"],
+["3px 6px 6px 3px 3px","21px"],
+["0px 6px 6px 0px 0px","12px"],
+["3px 6px 6px 3px 3px","21px"],
+["0px 8px 8px 8px 8px","32px"],
+["8px 6px 6px 8px 8px","36px"],
+["0px 8px 8px 8px 8px","32px"],
+["8px 6px 6px 8px 8px","36px"],
+["0px 8px 8px 8px 8px","32px"],
+["8px 6px 6px 8px 8px","36px"],
+["0px 6px 6px 0px 0px","12px"],
+["3px 6px 6px 3px 3px","21px"],
+["0px 6px 6px 0px 0px","12px"],
+["3px 6px 6px 3px 3px","21px"],
+["0px 6px 6px 0px 0px","12px"],
+["3px 6px 6px 3px 3px","21px"],
+["0px 6px 6px 0px 0px","12px"],
+["3px 6px 6px 3px 3px","21px"],
+["0px 6px 6px 0px 0px","12px"],
+["3px 6px 6px 3px 3px","21px"],
+["0px 6px 6px 0px 0px","12px"],
+["3px 6px 6px 3px 3px","21px"],
+["0px 6px 6px 0px 0px","12px"],
+["3px 6px 6px 3px 3px","21px"],
+["0px 6px 6px 0px 0px","12px"],
+["3px 6px 6px 3px 3px","21px"],
+["0px 6px 6px 0px 0px","12px"],
+["3px 6px 6px 3px 3px","21px"],
+["0px 6px 6px 0px 0px","12px"],
+["3px 6px 6px 3px 3px","21px"],
+["4px 6px 6px 4px 4px","24px"],
+["4px 6px 6px 0px 0px","16px"],
+["0px 6px 6px 0px 0px","12px"],
+["4px 6px 6px 0px 0px","16px"],
+["0px 6px 6px 0px 0px","12px"],
+["4px 6px 6px 0px 0px","16px"],
+["0px 6px 6px 0px 0px","12px"],
+["4px 6px 6px 4px 4px","24px"],
+["4px 6px 6px 4px 4px","24px"],
+["4px 6px 6px 4px 4px","24px"],
+["4px 6px 6px 4px 4px","24px"],
+["4px 6px 6px 0px 0px","16px"],
+["0px 6px 6px 0px 0px","12px"],
+["4px 6px 6px 0px 0px","16px"],
+["0px 6px 6px 0px 0px","12px"],
+["4px 6px 6px 0px 0px","16px"],
+["0px 6px 6px 0px 0px","12px"],
+["4px 6px 6px 0px 0px","16px"],
+["0px 6px 6px 0px 0px","12px"],
+["4px 6px 6px 0px 0px","16px"],
+["0px 6px 6px 0px 0px","12px"],
+["4px 6px 6px 0px 0px","16px"],
+["0px 6px 6px 0px 0px","12px"],
+["4px 6px 6px 0px 0px","16px"],
+["0px 6px 6px 0px 0px","12px"],
+["4px 6px 6px 0px 0px","16px"],
+["0px 6px 6px 0px 0px","12px"],
+["4px 6px 6px 0px 0px","16px"],
+["0px 6px 6px 0px 0px","12px"],
+["4px 8px 8px 8px 8px","36px"],
+["8px 6px 6px 8px 8px","36px"],
+["4px 8px 8px 8px 8px","36px"],
+["8px 6px 6px 8px 8px","36px"],
+["4px 8px 8px 8px 8px","36px"],
+["8px 6px 6px 8px 8px","36px"],
+["4px 6px 6px 0px 0px","16px"],
+["0px 6px 6px 0px 0px","12px"],
+["4px 6px 6px 0px 0px","16px"],
+["0px 6px 6px 0px 0px","12px"],
+["4px 6px 6px 0px 0px","16px"],
+["0px 6px 6px 0px 0px","12px"],
+["4px 6px 6px 0px 0px","16px"],
+["0px 6px 6px 0px 0px","12px"],
+["4px 6px 6px 0px 0px","16px"],
+["0px 6px 6px 0px 0px","12px"],
+["4px 6px 6px 0px 0px","16px"],
+["0px 6px 6px 0px 0px","12px"],
+["4px 6px 6px 0px 0px","16px"],
+["0px 6px 6px 0px 0px","12px"],
+["4px 6px 6px 0px 0px","16px"],
+["0px 6px 6px 0px 0px","12px"],
+["4px 6px 6px 0px 0px","16px"],
+["0px 6px 6px 0px 0px","12px"],
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+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 8px 8px 8px 8px","33.5px"],
+["8px 6px 6px 8px 8px","36px"],
+["1.5px 8px 8px 8px 8px","33.5px"],
+["8px 6px 6px 8px 8px","36px"],
+["1.5px 8px 8px 8px 8px","33.5px"],
+["8px 6px 6px 8px 8px","36px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["3px 6px 6px 0px 0px","15px"],
+["0px 6px 6px 0px 0px","12px"],
+["3px 6px 6px 0px 0px","15px"],
+["0px 6px 6px 0px 0px","12px"],
+["3px 6px 6px 0px 0px","15px"],
+["0px 6px 6px 0px 0px","12px"],
+["0px 6px 6px 4px 4px","20px"],
+["4px 6px 6px 4px 4px","24px"],
+["0px 6px 6px 4px 4px","20px"],
+["4px 6px 6px 4px 4px","24px"],
+["0px 6px 6px 4px 4px","20px"],
+["4px 6px 6px 4px 4px","24px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 8px 8px 8px 8px","33.5px"],
+["8px 6px 6px 8px 8px","36px"],
+["1.5px 8px 8px 8px 8px","33.5px"],
+["8px 6px 6px 8px 8px","36px"],
+["1.5px 8px 8px 8px 8px","33.5px"],
+["8px 6px 6px 8px 8px","36px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+["1.5px 6px 6px 0px 0px","13.5px"],
+];
+
+function test() {
+  ok(expected.length > 0, "sanity check");
+  for (i = 0; i < expected.length; ++i) {
+    var msg = "";
+    if (actual[i][0] != expected[i][0]) {
+      msg = "'grid-template-columns' for grid index " + i + ":\n" + [...document.querySelectorAll('.grid')][i].outerHTML;
+      is(actual[i][0], expected[i][0], msg);
+    }
+    if (actual[i][1] != expected[i][1]) {
+      msg = "'width' for grid index " + i + ":\n" + [...document.querySelectorAll('.grid')][i].outerHTML;
+      is(actual[i][1], expected[i][1], msg);
+    }
+    if (msg != "") {
+      i = expected.length;  // stop after first failed grid by default
+    }
+  }
+  SimpleTest.finish();
+}
+
+</script>
+
+<script>
+window.onload = function() { setTimeout(test, 0); };
+SimpleTest.waitForExplicitFinish();
+</script>
+
+</body>
+</html>