Comment 5 for bug 1179997

@Andrew
Sadly, there were a lot of major changes made to the source code between those two releases. These include:

* Switching from a GTK+ dialog for configuring the applet to an AJAX-based webpage.
* Moving all blocking network calls to a separate thread.
* Support for the Messaging Menu.

That being said, I looked through the commits that were made immediately after the 1.4 release and revision #63 seems to be the most significant - particularly where I corrected the URL that opens when an item is selected. The old URL was retired a long time and leads to a 404 page.

Hope that helps.