diff --git a/toolkit/mozapps/extensions/content/extensions.js b/toolkit/mozapps/extensions/content/extensions.js
index 1e185f879..9576e9a3b 100644
--- a/toolkit/mozapps/extensions/content/extensions.js
+++ b/toolkit/mozapps/extensions/content/extensions.js
@@ -2153,7 +2153,7 @@ var gDiscoverView = {
                         Ci.nsIWebProgressListener.STATE_IS_REQUEST |
                         Ci.nsIWebProgressListener.STATE_TRANSFERRING;
     // Once transferring begins show the content
-    if (aStateFlags & transferStart)
+    if ((aStateFlags & transferStart) === transferStart)
       this.node.selectedPanel = this._browser;
 
     // Only care about the network events