Blocks annoying video ads on YouTube, Facebook ads, banners and much more.
Adblock Plus blocks all annoying ads, and supports websites by not blocking unobtrusive ads by default (configurable).
The most beautiful yet the simplest add-on that makes a strong colorful appeal. Colors every tab in a different color and makes them easy to distinguish while beautifying the overall appearance of the interface. For Seamonkey & Flock. An essential. F...
Signatures for Gmail, Google Mail, Yahoo Mail
A complete redesign of popular Google services, Google Redesigned changes the appearance of popular Google services.
Display all Google services as buttons or as a space-saving dropdown menu next to your address bar. Reach services like Gmail, Google reader, Google maps, Google calendar, and many more in a single click from your browser.
ShareThis for FireFox makes sharing simple. Share anything on the web with your friends on 45+ social sites including Facebook, Twitter, Email, Digg, Reddit and more. Track top trending shares by site and automatically save content to your ShareBox.
Send and receive signed and encrypted messages in Gmail.
A compilation of some of the best Greasemonkey user scripts for YouTube in one interface.
Enhance Flickr with a compilation of useful Greasemonkey scripts.
Add useful extra features to Google Reader, like feed favicons, inline article previews, and unread counts in your browser tab with Better GReader.
Collections are groups of related add-ons that anyone can create and share.Explore Collections