The Hyperwords add-on for Firefox allows you to select any word on a page, right click, and choose from a wealth of new options, such as: Reference, Search, Translation, Conversions, Email, Tag, Blog & More.

Cloudlet is a free Firefox browser extension that lets you Google the Internet faster. The application inserts context-aware tag clouds into a traditional Google, Yahoo and twitter interface to help you navigate more efficiently through search results.

For Firefox users, the Camelizer add-on lets you track price changes and purchasing trends from Amazon, Best Buy, and Newegg.

Create and manage your meetings from Google Calendar or Gmail with the ScheduleOnce Firefox add-on.

This Firefox browser add-on makes it possible to download your friend's photo albums on Facebook with a click of your mouse.

Raise money for charity when you shop at 900+ online stores. Download this safe, free browser extension and purchases made at participating stores will automatically be counted/donated to your charities of choice.