Extensions
Explore powerful tools and features to customize Firefox and make the browser all your own.
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Grammar and Spell Checker - LanguageTool
With this extension you can check text with the free style and grammar checker LanguageTool. It finds many errors that a simple spell checker cannot detect, like mixing up there/their, a/an, or repeating a word.
356,262 users
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Custom Scrollbars
Give Firefox a personal touch with customized scrollbars!
31,599 users
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automaticDark - Time-Based Theme Changer
Automatically change Firefox's theme based on the time.
6,622 users
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Measure-it
Draw a ruler across any webpage to check the width, height, or alignment of page elements in pixels.
28,221 users
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LeechBlock NG
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.
70,044 users
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SponsorBlock - Skip Sponsorships on YouTube
Easily skip YouTube video sponsors. When you visit a YouTube video, the extension will check the database for reported sponsors and automatically skip known sponsors. You can also report sponsors in videos. Other browsers: https://sponsor.ajay.app
443,428 users
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Privacy Badger
Automatically learns to block invisible trackers.
1,244,870 users
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Decentraleyes
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.
267,917 users
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Stylebot
Change the appearance of the web instantly
10,192 users
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Cookie AutoDelete
Control your cookies! This WebExtension is inspired by Self Destructing Cookies. When a tab closes, any cookies not being used are automatically deleted. Keep the ones you trust (forever/until restart) while deleting the rest. Containers Supported
238,138 users
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Tree Style Tab
Show tabs like a tree.
211,776 users
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Easy Youtube Video Downloader Express
A simple extension for superfast and easy YouTube downloads in FLV, 3GP, MP3, MP4, 720p, and 1080p formats.
593,608 users