Extensions are like apps for Firefox.
141,073 users
YouTube High Definition
YouTube High Definition is a powerful tool that automatically plays all YouTube videos in HD, changes video player size, offers auto-stop and mute, and much more.
Rated 3.9 out of 5Baris Derin
127,418 users
15,025 users
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
Rated 4.6 out of 5CAD Team
171,054 users
Kurzgesagt Planet Theme
Rated 4.3 out of 5modables
20,042 users
Хэллоуин21
Rated 3.8 out of 5redcardinal
159 users
green purple
Rated 4.8 out of 5Enriquette
56 users
Translate Web Pages
Translate your page in real time using Google or Yandex. It is not necessary to open new tabs. Now works with the NoScript Extension.
Rated 4.8 out of 5Filipe Ps
394,397 users
To Google Translate
Right-click a section of text and click the Translate icon next to it to text translate or listen to it in your language.
Rated 4.1 out of 5Juan Escobar
805,464 users
Simple Translate
Quickly translate selected text on web page. In toolbar popup, you can translate input text.
Rated 4.8 out of 5sienori
116,291 users
ImTranslator: Translator, Dictionary, TTS
COMPLETELY REDESIGNED TRANSLATOR FOR FIREFOX ImTranslator translates text, words, webpages between more than 100 languages. NEW: Inline Translator, Dictionary, access to Google Translate, Microsoft Translator. Unique on the fly localization.
Rated 4.5 out of 5Smart Link Corporation
164,319 users
uBlock Origin
Finally, an efficient wide-spectrum content blocker. Easy on CPU and memory.
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5,293,914 users
Ghostery – Privacy Ad Blocker
Ghostery is a powerful privacy extension. Block ads, stop trackers and speed up websites.
Rated 4.3 out of 5Ghostery
1,178,625 users
AdBlock for Firefox
The most popular ad blocker for Chrome and Safari, now available for Firefox! Block all advertisements on all web pages, even Facebook, Youtube, and Hulu. Browse faster, too! Most ads aren't even downloaded at all, saving you time and bandwidth.
Rated 4.3 out of 5AdBlock
1,021,829 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 5Adguard Software Ltd
654,086 users
141,073 users
OneTab
OneTab - Too many tabs? Convert tabs to a list and reduce browser memory
Rated 4.2 out of 5OneTab Team
119,239 users
New Tab Override
New Tab Override allows you to set the page that shows whenever you open a new tab.
Rated 4.3 out of 5Sören Hentzschel
71,751 users
Tab Reloader (page auto refresh)
An easy-to-use tab reloader with custom reloading time settings for individual tabs
Rated 4 out of 5James Fray
71,633 users
Ghostery – Privacy Ad Blocker
Ghostery is a powerful privacy extension. Block ads, stop trackers and speed up websites.
Rated 4.3 out of 5Ghostery
1,178,625 users
1,012,092 users
HTTPS Everywhere
Encrypt the web! HTTPS Everywhere is a Firefox extension to protect your communications by enabling HTTPS encryption automatically on sites that are known to support it, even when you type URLs or follow links that omit the https: prefix.
Rated 4.7 out of 5EFF Technologists
724,316 users
DuckDuckGo Privacy Essentials
Privacy, simplified. Our add-on provides the privacy essentials you need to seamlessly take control of your personal information, no matter where the internet takes you: tracker blocking, smarter encryption, DuckDuckGo private search, and more.
Rated 4.6 out of 5DuckDuckGo
1,508,164 users
BTRoblox - Making Roblox Better
BTRoblox, or Better Roblox, is an extension that aims to enhance Roblox's website by modifying the look and adding to the core website functionality by adding a plethora of new features.
Rated 4 out of 5AntiBoomz
25,908 users
RoPro - Enhance Your Roblox Experience
The perfect tool for players & traders. Add dozens of useful features to Roblox.
Rated 4.6 out of 5RoPro Development Team
3,900 users
RoGold
RoGold is a Roblox extension. It provides powerful and useful tools for both developers and normal users.
Rated 4.7 out of 5AlexOp
921 users