Are you using the Debian packages or the Mozilla-provided ones (I assume the former, since you mentioned that you do all of the updates every morning)?
Yes, try moving the .mozilla directory to a temporary directory to ignore it (or create a new user and try it with that account). Did you install many extensions? I had random combinations of extensions do the most bizarre thing to my browser. Especially when these extensions were not from the official website. Just some ideas. -- Leonid Grinberg [EMAIL PROTECTED] http://www.lgrinberg.org