Add-ons for Firefox (en-US)

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Livemarks

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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

Tab Stash
Easily save and organize batches of tabs as bookmarks. Clear your tabs, clear your mind. Only for Firefox.
Rated 4.6 out of 5
Josh Berry
36,803 users
Download All Images
Easily save images with a wide range of customization features, such as file size, dimensions, and image type.
Rated 3.9 out of 5
Joe Ertaba
96,304 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
76,496 users
Easy Youtube Video Downloader Express
A simple extension for superfast and easy YouTube downloads in FLV, 3GP, MP3, MP4, 720p, and 1080p formats.
Rated 4.1 out of 5
Dishita
505,529 users

Top rated themes

Kirby9
Rated 5 out of 5
＼(^o^)／
9,438 users
Praise the sun (animated)
Rated 4.9 out of 5
anon
16,186 users
Spirited Away (Animated)
Rated 4.9 out of 5
Max
22,665 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
21,574 users
Tree Style Tab
Show tabs like a tree.
Rated 4.5 out of 5
Piro (piro_or)
222,223 users
Simple Tab Groups
Create, modify, and quickly change tab groups
Rated 4 out of 5
Drive4ik
103,542 users
OneTab
OneTab - Too many tabs? Convert tabs to a list and reduce browser memory
Rated 4.2 out of 5
OneTab Team
173,134 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
9,678,822 users
Video DownloadHelper
Download videos from the web. Easy, smart, no tracking.
Rated 4.3 out of 5
mig
1,936,904 users
Privacy Badger
Automatically learns to block invisible trackers.
Rated 4.8 out of 5
EFF Technologists
1,891,393 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
1,408,568 users

Recommended themes

C.E.Coral Reef 3
Rated 4.8 out of 5
Creative_Expressions (Gale)
1,189 users
Everforest Dark Medium Theme
Rated 4.8 out of 5
Bullfinch
1,927 users
Animated│Geometric Hexagon
Rated 5 out of 5
Pavol Polák
3,625 users

Twitch extensions

BetterTTV
Enhances Twitch and YouTube with new features, emotes, and more.
Rated 4.6 out of 5
NightDev
490,689 users
Alternate Player for Twitch.tv
Alternate player of live broadcasts for Twitch.tv website.
Rated 4.3 out of 5
Alexander Choporov (CoolCmd)
36,086 users
Twitch Chat pronouns
Add Pronouns to Twitch Chat
Rated 3.4 out of 5
Alejo Pereyra
16,084 users
Unwanted Twitch
Hide unwanted streams, games, categories, channels and tags on: twitch.tv
Rated 4.2 out of 5
kwaschny.net
5,834 users

“mp3” tagged extensions

Easy Youtube Video Downloader Express
A simple extension for superfast and easy YouTube downloads in FLV, 3GP, MP3, MP4, 720p, and 1080p formats.
Rated 4.1 out of 5
Dishita
505,529 users
600% Sound Volume
Up to 600% volume boost
Rated 4.5 out of 5
Aliaksandr
175,550 users
Global Speed
Set a default speed for video and audio.
Rated 4.7 out of 5
POLYWOCK
66,372 users
YouTube mp3
The YouTube-mp3 Add-on generates a "MP3" button on YouTube. Convert YouTube to mp3 and download the file to your device.
Rated 3.5 out of 5
Addon Developer
36,079 users