Add-ons
To try the thousands of add-ons available here, download Mozilla Firefox, a fast, free way to surf the Web!
CloseWelcome to Firefox Add-ons.
Choose from thousands of extra features and styles to make Firefox your own.
CloseMost Popular All »
- 1. Adblock Plus 20,629,655 users
- 2. Video DownloadHelper 4,447,530 users
- 3. Easy Screenshot 2,340,791 users
- 4. NoScript Security Suite 2,156,831 users
- 5. Firebug 2,137,116 users
- 6. Ghostery 1,458,772 users
- 7. Greasemonkey 1,293,751 users
- 8. DownThemAll! 1,293,105 users
- 9. Adblock Plus Pop-up Addon 1,130,806 users
- 10. uBlock Origin 1,111,784 users
Featured Extensions See all »
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Theme Font & Size Changer lets you change the global font size and font family used for the user interface in Firefox. Design your browser with your favorite font.This add-on is not compatible with your version of Firefox because of the following:
97,270 users -
Tab Mix Plus enhances Firefox's tab browsing capabilities. It includes such features as duplicating tabs, controlling tab focus, tab clicking options, undo closed tabs and windows, plus much more. It also includes a full-featured session manager.This add-on is not compatible with your version of Firefox because of the following:
843,888 users -
FireSSH is a free, cross-platform SSH terminal client for Mozilla Firefox. Written entirely in Javascript!This add-on is not compatible with your version of Firefox because of the following:
29,557 users -
YouTube High Definition is a powerful tool that will let you automatically play all YouTube videos in HD (High Definition), turn off annotations, change video player size, auto stop videos, auto mute videos, control embedded videos and much more.This add-on is not compatible with your version of Firefox because of the following:
284,334 users -
DuckDuckGo is the search engine that doesn't track you. We also have smarter answers and less clutter. This extension makes DuckDuckGo available in the address bar, search bar and right-click menu. Also adds a handy toolbar button with more features!This add-on is not compatible with your version of Firefox because of the following:
125,643 users -
Preview and navigate tab contents through popup.This add-on is not compatible with your version of Firefox because of the following:
138,108 users -
Jump-to-word buttons and highlighting for the search box contentThis add-on is not compatible with your version of Firefox because of the following:
20,234 users -
The first and only download manager/accelerator built inside Firefox!
This add-on is not compatible with your version of Firefox because of the following:
1,293,105 users -
Ecosia is a search engine that donates 80% of its surplus income to planting trees. By searching with Ecosia you can help the environment for free.
This add-on is not compatible with your version of Firefox because of the following:
This extension adds Ecosia.org as the default search engine to your Firefox. Give it a try!94,752 users -
A quick and minimalistic way to create bookmarks.
This add-on is not compatible with your version of Firefox because of the following:
11,190 users -
Manage your installed personas (lightweight themes).
This add-on is not compatible with your version of Firefox because of the following:
12,942 users -
Quickly and easily switch between popular user-agent strings.
This add-on is not compatible with your version of Firefox because of the following:
48,166 users -
Customize the way a web page displays or behaves, by using small bits of JavaScript.
This add-on is not compatible with your version of Firefox because of the following:
1,293,751 users -
Lightbeam is a Firefox add-on that enables you to see the first and third party sites you interact with on the Web. Using interactive visualizations, Lightbeam shows you the relationships between these third parties and the sites you visit.
This add-on is not compatible with your version of Firefox because of the following:
511,931 users -
— Open web pages saved with Internet Explorer or other browsers (MHT)
This add-on is not compatible with your version of Firefox because of the following:
— Save many tabs, video and audio reliably, in a single ZIP file (MAFF)
— Return to the original site you saved a page from, and more!170,390 users -
Find out which websites you can trust. WOT adds intuitive traffic light-style icons next to search results and URLs so you can decide whether to visit a site:
This add-on is not compatible with your version of Firefox because of the following:
• Green – The site is trusted
• Yellow – Be cautious
• Red – Online threats detected939,605 users -
With gtranslate you can translate any text in a web page just by selecting and right-clicking over it. The extension uses the Google translation services to translate the text.
This add-on is not compatible with your version of Firefox because of the following:
81,995 users -
Tired of having multiple tabs open just to view your favorite Google services and other Apps like Feedly, Evernote, Twitter and more? Now you can see them right from your Gmail Inbox.
This add-on is not compatible with your version of Firefox because of the following:
Install now or visit www.integratedinbox.com for more info.13,444 users
Up & Coming Extensions See all »
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With Cartt you'll get the best offers while shopping.This add-on is not compatible with your version of Firefox because of the following:
2,020 users -
Convert any webpage to a pdf quicklyThis add-on is not compatible with your version of Firefox because of the following:
4,263 users -
YouTube Video Download and Convert is the powerful add-on that lets you collect all media information available on YouTube. Advanced power panel lets you download, preview, play with and convert all media right inside Firefox.This add-on is not compatible with your version of Firefox because of the following:
29,382 users -
Easy to use youtube video to mp3 downloaderThis add-on is not compatible with your version of Firefox because of the following:
8,384 users -
Firebug extension for web analytics testing and debuggingThis add-on is not compatible with your version of Firefox because of the following:
15,710 users -
Use one of hundreds of unique new tab page experiences brought to you by Brand Thunder.This add-on is not compatible with your version of Firefox because of the following:
1,247 users -
Prevent boring messages like "disable AdBlock and refresh page to continue"
This add-on is not compatible with your version of Firefox because of the following:
2,841 users -
Play the Delta game directly from your browser.
This add-on is not compatible with your version of Firefox because of the following:
5,407 users -
Adds a new page that shows add-on memory usage
This add-on is not compatible with your version of Firefox because of the following:
4,172 users -
跨平台、跨浏览器、跨网站，一个软件、一个账号，就可以去吐槽全球；无视删帖、关闭评论；槽友互踩互赞、相互喷翔，热闹非凡；内容加密，防脱裤，安全可靠，拒绝查水表.业界良心，尊重用心隐私，绝不收集敏感数据。
This add-on is not compatible with your version of Firefox because of the following:
12,057 users -
Это дополнение позволяет синхронизировать ваш плейлист в соцсети ВКонтакте с любой вашей папкой на диске.
This add-on is not compatible with your version of Firefox because of the following:
1,523 users -
Add a custom useragent string for desired URLs or domains.
This add-on is not compatible with your version of Firefox because of the following:
3,091 users -
Auto unloads tabs.
This add-on is not compatible with your version of Firefox because of the following:
***New Version***7,114 users -
Block/Allow images by pressing user-defined hotkeys or a toggle button.
This add-on is not compatible with your version of Firefox because of the following:
8,202 users -
The most popular userscript manager for Blink-based browsers
This add-on is not compatible with your version of Firefox because of the following:
9,788 users -
Firefox does not natively support the mime-type application/vnd.wap.xhtml+xml. This is one of the possible mime-types for XHTML Mobile Profile. This addon adds support for this mime-type.
This add-on is not compatible with your version of Firefox because of the following:
9,063 users -
TubeBuddy is a browser extension built for YouTube creators that can save hours of time, help optimize videos, help engage with your audience and a whole lot more.
This add-on is not compatible with your version of Firefox because of the following:
2,326 users -
Allows manipulation of the playback rate of HTML5 videos
This add-on is not compatible with your version of Firefox because of the following:
10,963 users
Featured Themes See all »
Featured Collections See all »
To create your own collections, you must have a Mozilla Add-ons account.
