I find myself trying out different extensions, most of which I keep. Nevertheless, the turnover of them has been high, so in order to keep a constantly up to date list of the extensions I have installed, I created a page listing all my FireFox extensions and Scripts. You will see the link to this page also on the right hand sidebar (brown) at the top under Pages heading.

 While I am at it, if you are a Gmail fan like me, and have Greasemonkey installed on your FireFox, you really are going to find the scripts mentioned under this post very useful. It is written by a Google employee who works on Gmail himself.