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).
Tab Mix Plus enhances Firefox's tab browsing capabilities. It includes such features as duplicating tabs, controlling tab focus, tab clicking options, undo closed tabs and windows, plus much more. It also includes a full-featured session manager.
BlockSite is an extension, which automagically blocks websites of your choice. Additionally, this extension will disable all hyperlinks to these websites, by just displaying the link text without the clicking functionality.
Use tamperdata to view and modify HTTP/HTTPS headers and post parameters...
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!
Translate the whole entire page or just a selection using Google Translate.
StumbleUpon is the easiest way to discover new and interesting photos, videos, web pages and more, recommended by a community of experts. Tell us what you are interested in and we recommend page after page of amazing stuff you’d never expect to see.
The Ultimate YouTube Enhancer! Instantly add many tweaks to YouTube including: Download Videos, Convert Videos to Mp3, Automatically Watch in HD, Change YouTube Style, Watch Multiple Videos, Loop Videos, and much more. A must have for YouTube users.
Asks for the master password at startup (fixes multiple password prompt)
ImgLikeOpera allows load only the images that you want in Firefox browser. This extension is very useful for non broadband users...
Bengali Bangladesh (bn-BD) spell checking dictionary.
Collections are groups of related add-ons that anyone can create and share.Explore Collections