• Greasemonkey: You just need this one to be able to run some of the others listed below.
• Gmail Manager: If you have several Gmail accounts, it might be quite annoying to switch from one account to another. This add-on located at the bottom right of the browser will show you how many mails you have in each account and will enable you to go through all your accounts swiftly.
• Better Gmail 2: This one improves the way information is showed on Gmail (e.g. putting on the favicon how many unread emails you have).
• Better GReader: If you have hundreds of RSS feeds in Google Reader, it might be quite hard to go through them quickly. This adds-on, by giving different colours to the feeds, makes your task a hundred times easier.
• Better GCal: Get week numbers, colours for weekends and other little details that make a difference.
• Xoopit for Gmail: Finding documents in your web mail might be a pain in the ass and Xoopit is the right solution for that. It enables you to run search and filter the documents. A time and headache saver!
• Zemanta: Add pictures and relevant articles to your emails.
• Gspace: Embrace cloud computing by transforming the MB of your email box into a space to store documents.
• Blank Canvas Gmail Signature or WiseStamp: Add a customized signature to your emails.
• Google Gears: As Google says it, “a Firefox extension that allows to navigate on compatible websites offline and synchronize when going back online”.

If you know any other good Firefox add-on please leave a comment and I will add it to the list.

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