bug 370555 don't hide "about:blank" url when opened by another window, r=mconnor

browser/base/content/browser.js

@@ -2294,7 +2294,7 @@ function handleURLBarRevert()
   // don't revert to last valid url unless page is NOT loading
   // and user is NOT key-scrolling through autocomplete list
   if ((!throbberElement || !throbberElement.hasAttribute("busy")) && !isScrolling) {
-    if (url != "about:blank") {
+    if (url != "about:blank" || content.opener) {
       gURLBar.value = url;
       gURLBar.select();
       SetPageProxyState("valid");
@@ -3842,8 +3842,9 @@ nsBrowserStatusHandler.prototype =
     var browser = getBrowser().selectedBrowser;
     if (aWebProgress.DOMWindow == content) {
 
-      if (location == "about:blank" || location == "") {   //second condition is for new tabs, otherwise
-        location = "";                                     //reload function is enabled until tab is refreshed
+      if ((location == "about:blank" && !content.opener) ||
+           location == "") {                        //second condition is for new tabs, otherwise
+        location = "";                              //reload function is enabled until tab is refreshed
         this.reloadCommand.setAttribute("disabled", "true");
         this.reloadSkipCacheCommand.setAttribute("disabled", "true");
       } else {

toolkit/content/widgets/tabbrowser.xml

@@ -620,12 +620,13 @@
             // If location bar is hidden and the URL type supports a host,
             // add the scheme and host to the title to prevent spoofing.
             // XXX https://bugzilla.mozilla.org/show_bug.cgi?id=22183#c239
-            // (only for schemes that support a host)
             try {
               if (docElement.getAttribute("chromehidden").indexOf("location") != -1) {
                 var uri = this.mURIFixup.createExposableURI(
                             this.mCurrentBrowser.currentURI);
-                if (uri.host)
+                if (uri.scheme == "about")
+                  newTitle = uri.spec + sep + newTitle;
+                else
                   newTitle = uri.prePath + sep + newTitle;
               }
             } catch (e) {}