This should fix at least some of the assertions (harpoon orange)...just commenting two things out.

xpfe/browser/resources/content/navigator.js

@@ -1085,7 +1085,7 @@ function BrowserPageInfo(doc)
 function hiddenWindowStartup()
 {
   // Disable menus which are not appropriate
-  var disabledItems = ['cmd_close', 'Browser:SendPage', 'Browser:EditPage', 'Browser:PrintSetup', 'Browser:PrintPreview',
+  var disabledItems = ['cmd_close', 'Browser:SendPage', 'Browser:EditPage', /*'Browser:PrintSetup', 'Browser:PrintPreview',*/
                        'Browser:Print', 'canGoBack', 'canGoForward', 'Browser:Home', 'Browser:AddBookmark', 'cmd_undo',
                        'cmd_redo', 'cmd_cut', 'cmd_copy','cmd_paste', 'cmd_delete', 'cmd_selectAll'];
   for (id in disabledItems) {