Explore powerful tools and features to customize Firefox and make the browser all your own.
Firefox Multi-Account Containers lets you keep parts of your online life separated into color-coded tabs that preserve your privacy. Cookies are separated by container, allowing you to use the web with multiple identities or accounts simultaneously.
An easy-to-use font inspector to get CSS styles of the selected element
View archived and cached versions of web pages on 10+ search engines, such as the Wayback Machine, Archive.is, Google, Bing, Yandex, Gigablast, WebCite, Sogou, Memento, Naver and Yahoo Japan.
Spoofs User-Agent strings of your browser with a new one globally, randomly or per hostname
Squared tabs, application button menu, add-on bar, small button view, old search and many more 'old' features for 'Firefox 29-56' only, not for Firefox Quantum (57+)! >Latest builds only on Github!<
Tab Groups are an easy way to organize a lot of tabs. You can visually group related tabs, switch between groups, and quickly search through all of your tabs to switch to a specific one.
Ad Blocking, remastered. Incognito Adblocker took all of the best ad blocking and privacy protection features you’d expect in an adblocker extension and advanced them to create the best adblock extension yet.
Short, Vim-style keyboard shortcuts for browsing and navigation, for a near mouseless experience.
Run Instagram on Desktop just like your favorite mobile app. Enjoy the most beautiful Instagram Web client. ★ turn on Instagram Night mode ★ download stories and photos ★ upload from your PC or Mac
Provides ability to disable "about:*" pages by the configuration.
Complete YouTube video download is the ultimate YouTube downloader that allows you to save any video from YouTube to your favorite format (MP3, MP4, WEBM, M4A, 3GP, Subtitles and thumbnails)
List addons in Windows' "Add or Remove Programs".