backing out bug 169826 (Port patch from bug 164006 to Firefox (wyciwyg: in tab titles)) as it caused bug 297037 / 297047

browser/base/content/tabbrowser.xml

@@ -621,6 +621,8 @@
 
             // Update the URL bar.
             var loc = this.mCurrentBrowser.currentURI;
+            if (!loc)
+              loc = ({ spec: "" });
 
             var webProgress = this.mCurrentBrowser.webProgress;
             var securityUI = this.mCurrentBrowser.securityUI;
@@ -850,7 +852,7 @@
           <![CDATA[
             var browser = this.getBrowserForTab(aTab);
             var crop = "end";
-            var title = browser.contentTitle;
+            var title = browser.contentDocument.title;
             
             if (!title) {
               if (browser.currentURI.spec) {