• downloads http://www.mozilla.org/
• commentry http://www.mozillazine.org/
• customising http://www.mozilla.org/unix/customizing.html

mail/news

• mailnews http://www.mozilla.org/mailnews/
• Mail Conversion
• intertwingle

extensions

• enigmail (GPG support) http://enigmail.mozdev.org/
• annotation support http://cohse.semanticweb.org/mozilla/annotation/

monster children

• newsmonster RSS agrigator http://www.newsmonster.org/