Horde + Firefox = Bad Times

I noticed that the updated version of Horde has serious display issues in firefox; specifically, when a folder name in the inline side menu is longer than the menu is wide. You can see a reproduction of the bug submitted to Horde developers here:
http://bugs.horde.org/ticket/?id=1025

I have two questions:
(1) This appears to be a server-platform-independant rendering issue caused by Horde's output. However, it's not clear whether this is an issue with Horde itself or perhaps due to internal upgrade issues related to cPanel's upgrade function (like leaving in an old file).

(2) Does anyone have a reasonable work around? The Mozilla side bar option works, but it isn't incredibly convenient. If anyone has already taken the time to patch up the code that causes the incorrect output, it would be awesome if you could share it.

WHM 10.0.0 cPanel 10.0.0-R85
RedHat 9 i686 - WHM X v3.1.0