GMail Manager

GMail Manager allows you to manage multiple gmail accounts, which is perfect for those of us who like keeping online, work, and school emails separate. The addon displays specific accout information such as unread messages, drafts, space used, and new mail snippets.

With the addon you can check to see if you have any new mail with a glance at the bottom right hanhd corner of your browser, which displays the account and the number of new emails in the inbox. GMail Manager also boasts a plethora of options, which can be changed on a per account basis. You can change how often you want the addon to check your inbox for new mail, or even configure it to play a sound file when a new message is received.