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).
Find out which websites you can trust. WOT adds intuitive traffic light-style icons next to search results and URLs to help you make informed decisions about whether to visit a site or not.
Fight the text ads! Element Hiding Helper is a companion extension for Adblock Plus meant to make creating element hiding rules easier.
View HTTP headers of a page and while browsing.
Use tamperdata to view and modify HTTP/HTTPS headers and post parameters...
Session Manager saves and restores the state of all or some windows - either when you want it or automatically at startup and after crashes. It can also automatically save the state of open windows individually.
Scrolls the page smoothly when scrolling the mouse wheel (or keyboard arrows if enabled).
Lets you load pages in IE with a single right-click, or mark certain sites to *always* load in IE.
A light-weight Google search toolbar for Firefox. Offers 14 search types, Google search suggestions (in 5.0+), search history auto-completion, a customizable toolbar, search word highlighting, and more.
Useful tools for the nightly tester.
Displays the progress of the current uploads. Useful for sites that does not shows the upload progress like youtube.
View Dependencies adds a tab to the Page Info window, in which it lists all the files which were loaded to show the current page.
Collections are groups of related add-ons that anyone can create and share.Explore Collections