Bug 1134363 - Have Reader Mode use the same tab title as the normal browser view. r=niklas,mtigley

Differential Revision: https://phabricator.services.mozilla.com/D142281

browser/actors/AboutReaderChild.jsm

@@ -23,6 +23,7 @@ ChromeUtils.defineModuleGetter(
 );
 
 var gUrlsToDocContentType = new Map();
+var gUrlsToDocTitle = new Map();
 
 class AboutReaderChild extends JSWindowActorChild {
   constructor() {
@@ -53,6 +54,7 @@ class AboutReaderChild extends JSWindowActorChild {
             this.document.URL,
             this.document.contentType
           );
+          gUrlsToDocTitle.set(this.document.URL, this.document.title);
           this._articlePromise = ReaderMode.parseDocument(this.document).catch(
             Cu.reportError
           );
@@ -133,10 +135,12 @@ class AboutReaderChild extends JSWindowActorChild {
               ? "text/plain"
               : "document";
 
+          let docTitle = gUrlsToDocTitle.get(url);
           this._reader = new AboutReader(
             this,
             this._articlePromise,
-            docContentType
+            docContentType,
+            docTitle
           );
           this._articlePromise = null;
         }

browser/base/content/tabbrowser.js

@@ -1595,7 +1595,7 @@
     },
 
     _setTabLabel(aTab, aLabel, { beforeTabOpen, isContentTitle } = {}) {
-      if (!aLabel) {
+      if (!aLabel || aLabel.includes("about:reader?")) {
         return false;
       }
 

toolkit/components/reader/AboutReader.jsm

@@ -47,7 +47,12 @@ const zoomOnMeta =
   Services.prefs.getIntPref("mousewheel.with_meta.action", 1) == 3;
 const isAppLocaleRTL = Services.locale.isAppLocaleRTL;
 
-var AboutReader = function(actor, articlePromise, docContentType = "document") {
+var AboutReader = function(
+  actor,
+  articlePromise,
+  docContentType = "document",
+  docTitle = ""
+) {
   let win = actor.contentWindow;
   let url = this._getOriginalUrl(win);
   if (
@@ -73,6 +78,8 @@ var AboutReader = function(actor, articlePromise, docContentType = "document") {
   }
   doc.documentElement.setAttribute("platform", AppConstants.platform);
 
+  doc.title = docTitle;
+
   this._actor = actor;
   this._isLoggedInPocketUser = undefined;
 
@@ -1074,7 +1081,12 @@ AboutReader.prototype = {
       article.readingTimeMinsSlow,
       article.readingTimeMinsFast
     );
+
+    // If a document title was not provided in the constructor, we'll fall back
+    // to using the article title.
+    if (!this._doc.title) {
       this._doc.title = article.title;
+    }
 
     this._containerElement.setAttribute("lang", article.lang);