The easy way to download and convert Web videos from hundreds of YouTube-like sites.
Use the Evernote Web Clipper to save things you see on the web into your Evernote account.
Xmarks is the #1 bookmarking and open tab add-on. Keep your bookmarks, and open tabs backed up and synchronized across computers and browsers. Mobile phones with Premium access. Utilize LastPass to sync passwords!
Save time by speeding up repetitive tasks. Get faster, parallelized downloads, see definitions, auto-load the next page, improve searching, and more. FastestFox will dramatically enhance your productivity!
Adds ClickOnce support and the ability to report installed .NET versions to the web server.
Protect your Passwords, Payments, and Privacy.
Adds the ability to create and edit entries in the password manager.
AddThis for Firefox is the best add-on to make sharing and bookmarking simple. Have all your favorite web 2.0 social networking, bookmarking, blogging, and e-mail services at your fingertips. Share any page, anytime, with anyone.
This extension provides advanced configuration for your browser and many additional options, which are not displayed in the Firefox Preferences.
Add useful extra features to Gmail, like hierarchical labels, an unread message icon on your browser tab, file attachment icons, and more.
This extension adds a new "FaviconizeTab" option to the context menu of the tab...
The essential add-on for finding food and nutritional info while you surf. Highlights popular foods on any page and gives you helpful info about the food, from calories and fat to carbs and Weight Watchers points.
Turn tabs of your choice into permanent tabs. PermaTabs can't be closed accidentally no matter what you click (even actions like "Close other tabs" will not affect them) and will stick around between sessions.