Firefox Email Help
Notes from ClifNotes, Sep 2007, permalink Email Tips
Here's a good collection of email tips and tricks for Firefox users.
Quote from the website
If email is an inevitable part of your everyday online life, and you spend a lot of time browsing the web, perhaps you should consider managing at least a part of your email related tasks from Firefox itself. Mashable has compiled over 20 Firefox plugins which enable you to send, receive, check and manage emails from your favorite web browser.
http://mashable.com/2007/08/27/firefox-email/