--- a/browser/app/profile/firefox.js
+++ b/browser/app/profile/firefox.js
@@ -1494,17 +1494,17 @@ pref("browser.newtab.preload", true);
 pref("browser.newtabpage.enabled", true);
 
 // number of rows of newtab grid
 pref("browser.newtabpage.rows", 3);
 
 // number of columns of newtab grid
 pref("browser.newtabpage.columns", 3);
 
-pref("browser.newtabpage.directory.source", "chrome://global/content/directoryLinks.json");
+pref("browser.newtabpage.directory.source", "data:application/json,{}");
 
 // Enable the DOM fullscreen API.
 pref("full-screen-api.enabled", true);
 
 // True if the fullscreen API requires approval upon a domain entering fullscreen.
 // Domains that have already had fullscreen permission granted won't re-request
 // approval.
 pref("full-screen-api.approval-required", true);

--- a/browser/base/content/test/general/browser_tabopen_reflows.js
+++ b/browser/base/content/test/general/browser_tabopen_reflows.js
@@ -102,18 +102,18 @@ function test() {
       // Remove reflow observer and clean up.
       docShell.removeWeakReflowObserver(observer);
       gBrowser.removeCurrentTab();
       finish();
     });
   });
 
   Services.prefs.setBoolPref(PREF_PRELOAD, false);
-  // set directory source to empty links
-  Services.prefs.setCharPref(PREF_NEWTAB_DIRECTORYSOURCE, "data:application/json,{}");
+  // set directory source to dummy/empty links
+  Services.prefs.setCharPref(PREF_NEWTAB_DIRECTORYSOURCE, 'data:application/json,{"test":1}');
 }
 
 let observer = {
   reflow: function (start, end) {
     // Gather information about the current code path.
     let path = (new Error().stack).split("\n").slice(1).map(line => {
       return line.replace(/:\d+:\d+$/, "");
     }).join("|");

--- a/browser/base/content/test/newtab/head.js
+++ b/browser/base/content/test/newtab/head.js
@@ -84,17 +84,18 @@ function watchLinksChangeOnce() {
  * Provide the default test function to start our test runner.
  */
 function test() {
   waitForExplicitFinish();
   // start TestRunner.run() after directory links is downloaded and written to disk
   watchLinksChangeOnce().then(() => {
     TestRunner.run();
   });
-  Services.prefs.setCharPref(PREF_NEWTAB_DIRECTORYSOURCE, "data:application/json,{}");
+  // set directory source to dummy/empty links
+  Services.prefs.setCharPref(PREF_NEWTAB_DIRECTORYSOURCE, 'data:application/json,{"test":1}');
 }
 
 /**
  * The test runner that controls the execution flow of our tests.
  */
 let TestRunner = {
   /**
    * Starts the test runner.

--- a/dom/base/nsGlobalWindow.cpp
+++ b/dom/base/nsGlobalWindow.cpp
@@ -2342,16 +2342,18 @@ nsGlobalWindow::SetNewDocument(nsIDocume
   if (aForceReuseInnerWindow &&
       !wouldReuseInnerWindow &&
       mDoc &&
       mDoc->NodePrincipal() != aDocument->NodePrincipal()) {
     NS_ERROR("Attempted forced inner window reuse while changing principal");
     return NS_ERROR_UNEXPECTED;
   }
 
+  NS_ENSURE_TRUE(GetContextInternal(), NS_ERROR_NOT_INITIALIZED);
+
   nsCOMPtr<nsIDocument> oldDoc = mDoc;
 
 #ifndef MOZ_DISABLE_CRYPTOLEGACY
   // clear smartcard events, our document has gone away.
   if (mCrypto && XRE_GetProcessType() != GeckoProcessType_Content) {
     nsresult rv = mCrypto->SetEnableSmartCardEvents(false);
     NS_ENSURE_SUCCESS(rv, rv);
   }