Ever since I have started using Firefox, my work has become a lot easier thanks to loads of wonderful Firefox extensions. Gmail Manager is a Firefox extension that allows you to manage multiple Gmail accounts. You can also use it to receive new email notifications and check your messages.

You can also view account details including unread messages, drafts, messages, mail snippets etc. You can use it to import/export account preferences or load Gmail with a single click. You can quickly compose a message using it and it can auto detect mailto links. Its best feature is that it can easily manage multiple Gmail accounts.

The extension is compatible with Firefox 3 as well.