mozilla_home is your friend
I have the mozilla_home env var set; it points to my home directory. Moz created a tree under it to hold the user info. When I upgrade, I can zap the program tree, unzip the new version, and be off, with all my settings and email intact.
--\r\n-------------------------------------------------------------------\r\n* Jack Troughton jake at consultron.ca *\r\n* [link|http://consultron.ca|http://consultron.ca] [link|irc://irc.ecomstation.ca|irc://irc.ecomstation.ca] *\r\n* Kingston Ontario Canada [link|news://news.consultron.ca|news://news.consultron.ca] *\r\n-------------------------------------------------------------------