A cool Firefox extension to follow football leagues (not that i like football that much but it will be useful during the WK ;))

Tutorial on how to write Firefox extensions, which takes BugMeNot as an example

Stylish is a Firefox, Thunderbird, and Flock extension that allows easy management of user styles. User styles empower your browsing experience by letting you fix ugly sites, customize the look of your browser or mail client, or just have fun.

Records user actions on firefox and saves the recording to an xml file so that it can be replayedrecording. The output of the recorder can also be translated into automatic testing scripts such as httpunit, selenium, simple-test etc.

Fission combines address bar and progress bar, making the progress bar more visible and allowing for a nice visual effect.

A Firefox extension to add numbers to links

Nice list of Firefox extensions

Some Thunderbird functions to use with the keyconfig extension. Especially the Focus Threads, Messages and Folders Pane are useful

Adds keyboard shortcuts to change folder, move/copy messages, with folder name auto-completion.