Add-ons for Firefox (en-US)

RECOMMENDED

EPUBReader

Read ePUB files right in Firefox—increase font size, page dimensions & more.

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Extensions are like apps for Firefox.

They add features to Firefox to make browsing faster, safer, or just plain fun.

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Productivity tools

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YouTube customization

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Privacy & Security extensions

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Recommended extensions

History Cleaner
Deletes browsing history older than a specified number of days.
Rated 4.7 out of 5
Rayquaza01
17,454 users
Video Background Play Fix
Some sites may not work with Firefox for Android video background play feature. This add-on provides a quick fix by blocking the Page Visibility API and the Fullscreen API.
Rated 4.5 out of 5
JanH
192,687 users
Stylus
Redesign your favorite websites with Stylus, an actively developed and community driven userstyles manager. Easily install custom themes from popular online repositories, or create, edit, and manage your own personalized CSS stylesheets.
Rated 4.7 out of 5
Stylus Team
129,973 users
Popup Blocker (strict)
Strictly block all popup requests from any website by default. A notification window is opened to allow you accept, reject, open the popup in background page, or redirect the current page to popup address
Rated 4.2 out of 5
Jeremy Schomery
76,683 users

Top rated themes

Kirby9
Rated 5 out of 5
＼(^o^)／
9,613 users
Praise the sun (animated)
Rated 4.9 out of 5
anon
16,357 users
Spirited Away (Animated)
Rated 4.9 out of 5
Max
22,992 users

Tab managers

Tabby - Window & Tab Manager
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!
Rated 4.3 out of 5
BillK
22,085 users
Tree Style Tab
Show tabs like a tree.
Rated 4.5 out of 5
Piro (piro_or)
224,329 users
Simple Tab Groups
Create, modify, and quickly change tab groups
Rated 4 out of 5
Drive4ik
104,613 users
OneTab
OneTab - Too many tabs? Convert tabs to a list and reduce browser memory
Rated 4.2 out of 5
OneTab Team
174,545 users

Popular extensions

uBlock Origin
Finally, an efficient wide-spectrum content blocker. Easy on CPU and memory.
Rated 4.8 out of 5
Raymond Hill
9,747,784 users
Video DownloadHelper
Download videos from the web. Easy, smart, no tracking.
Rated 4.3 out of 5
mig
1,948,921 users
Privacy Badger
Automatically learns to block invisible trackers.
Rated 4.8 out of 5
EFF Technologists
1,902,769 users
AdGuard AdBlocker
Unmatched adblock extension against advertising and pop-ups. Blocks ads on Facebook, Youtube and all other websites.
Rated 4.7 out of 5
Adguard Software Ltd
1,415,421 users

Recommended themes

Dark Metall 1717
Rated 4.5 out of 5
Albert Baum
15,411 users
Green Nature 2
Rated 4.9 out of 5
Mirian Sousa
404 users
Green Side
Rated 3.8 out of 5
Cool_Creator5545
1,828 users

Twitch extensions

BetterTTV
Enhances Twitch and YouTube with new features, emotes, and more.
Rated 4.6 out of 5
NightDev
491,765 users
Alternate Player for Twitch.tv
Alternate player of live broadcasts for Twitch.tv website.
Rated 4.3 out of 5
Alexander Choporov (CoolCmd)
36,227 users
Twitch Chat pronouns
Add Pronouns to Twitch Chat
Rated 3.4 out of 5
Alejo Pereyra
16,117 users
Unwanted Twitch
Hide unwanted streams, games, categories, channels and tags on: twitch.tv
Rated 4.2 out of 5
kwaschny.net
5,853 users

“ad blocker” tagged extensions

uBlock Origin
Finally, an efficient wide-spectrum content blocker. Easy on CPU and memory.
Rated 4.8 out of 5
Raymond Hill
9,747,784 users
AdGuard AdBlocker
Unmatched adblock extension against advertising and pop-ups. Blocks ads on Facebook, Youtube and all other websites.
Rated 4.7 out of 5
Adguard Software Ltd
1,415,421 users
Ghostery – Privacy Ad Blocker
The best privacy tool and ad blocker extension for Firefox. Stop trackers, speed up websites and block ads everywhere including YouTube and Facebook.
Rated 4.3 out of 5
Ghostery
1,073,700 users
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
Rated 4.8 out of 5
Ajay (SponsorBlock)
625,369 users