This page documents how to do some non-obvious things with Firefox.
Unless noted otherwise, the instructions apply to Firefox 3.5 .
If you want to clear your history and your HTTP-authenticated sessions, follow those steps:
Since you can easily quit firefox by mistake, e.g by typing Ctrl-q instead of Ctrl-w, getting a warning asking whether we are sure is nice. Unfortunately a bug in firefox 3.5 disables this behavior under some circumstances
I haven't found a fix that worked for me: even installing Tab Mix Plus could not do anything when I did a Ctrl-q.
To backup my firefox configuration and extensions, I use an extension called FEBE .