Explore powerful tools and features to customize Firefox and make the browser all your own.
Draw a ruler across any webpage to check the width, height, or alignment of page elements in pixels.
Tabby helps you manage a lot of windows and tabs easily; it can help you open, close, move, pin, and do many other things on tabs and windows quickly. With Tabby, you can even save all you windows and tabs for later with just one click!
Download YouTube videos in all available formats and extract the original audio files
Get international weather updates (via AccuWeather.com) displayed right in Firefox with this highly customizable extension.
Protects you against tracking through "free", centralized, content delivery. It prevents a lot of requests from reaching networks like Google Hosted Libraries, and serves local files to keep sites from breaking. Complements regular content blockers.
A secure and free password manager for all of your devices.
Swiftly access your search engines in a popup panel when you select text in a webpage. Context menu also included!
LeechBlock NG is a simple productivity tool designed to block those time-wasting sites that can suck the life out of your working day. All you need to do is specify which sites to block and when to block them.
Watch streaming media with friends.
Save a complete page (with stylesheets, images, etc.) as a single HTML file
Tranquility Reader improves the readability of web articles by removing unnecessary elements like ads, images, social sharing widgets, and other distracting fluff.
Make every web page (or just the pages you want) display light text on dark backgrounds. All color variations are fully customizable.