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!
The Web Developer extension adds various web developer tools to the browser.
United States English Spellchecker for Firefox, Thunderbird and SeaMonkey by Kevin Atkinson and Geoff Kuenning.
To enable, right-click in a multi-line text box, select "Languages", then "English (United States)".
Advanced Eyedropper, Color Picker, Gradient Generator and other colorful goodies...
Get international weather forecasts from AccuWeather.com and display them in any toolbar or statusbar with this highly customizable and unobtrusive extension.
Drag, drop and arrange pictures adding photo titles, and create albums by multi-selecting photos, and then upload to one of a selection of online photo services - all of this without interrupting your Internet browsing.
Collections are groups of related add-ons that anyone can create and share.Explore Collections