Note: Republishing from The FF Extension Guru’s Blog One of the neat features of Thunderbird is the ability to customize the client with Extensions, Themes and Plug-Ins. But sometimes there are problems a theme does something funky to your browser. Or may be an extension goes haywire and gets corrupted. There are so many possibilities of what could be the problem. If you have a lot of extensions installed, it is hassle to list them all. Whenever anyone posts on Go Firefox! a more advanced problem they are having the first thing I recommend they do is install the InfoLister…