Bug 644186 - Open a new window when shift-clicking the "Open a new tab" button. r=Dao

browser/base/content/browser-sets.inc

@@ -20,7 +20,7 @@
     <command id="cmd_handleBackspace" oncommand="BrowserHandleBackspace();" />
     <command id="cmd_handleShiftBackspace" oncommand="BrowserHandleShiftBackspace();" />
 
-    <command id="cmd_newNavigatorTab" oncommand="BrowserOpenTab();"/>
+    <command id="cmd_newNavigatorTab" oncommand="BrowserOpenNewTabOrWindow(event);"/>
     <command id="Browser:OpenFile"  oncommand="BrowserOpenFileWindow();"/>
     <command id="Browser:SavePage" oncommand="saveDocument(window.content.document);"/>
 

browser/base/content/browser.js

@@ -7203,3 +7203,11 @@ let BrowserChromeTest = {
       this._cb = cb;
   }
 };
+
+function BrowserOpenNewTabOrWindow(event) {
+  if (event.shiftKey) {
+    OpenBrowserWindow();
+  } else {
+    BrowserOpenTab();
+  }
+}