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 first and only download manager/accelerator built inside Firefox!
Displays a country flag depicting the location of the current website's server and provides a multitude of tools such as site safety checks, whois, translation, similar sites, validation, URL shortening, and more...
The Web Developer extension adds various web developer tools to the browser.
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.
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!
German Dictionary (new Orthography) for spellchecking in Mozilla products
View HTTP headers of a page and while browsing.
Facilitates opening multiple tabs from the Bookmarks Menu and various other bookmark/history related dropdown menus. Less need to keep reopening menu, without using the sidebar. Optional auto-closing feature adds extra convenience.
Collections are groups of related add-ons that anyone can create and share.Explore Collections