Bug 580868 charsetOverlay should not cause XBL bindings to attach when it's not safe r+a=gavin

toolkit/content/charsetOverlay.js

@@ -245,6 +245,10 @@ function mailCharsetLoadListener (event)
     }
 }
 
+function InitCharsetMenu()
+{
+    removeEventListener("load", InitCharsetMenu, true);
+
     var wintype = document.documentElement.getAttribute('windowtype');
     if (window && (wintype == "navigator:browser"))
     {
@@ -268,5 +272,7 @@ else
             if (contentArea)
                 contentArea.addEventListener("pageshow", composercharsetLoadListener, true);
         }
-
     }
+}
+
+addEventListener("load", InitCharsetMenu, true);