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Stylish Requires Restart

Restyle the web with Stylish, a user styles manager. Stylish lets you easily install themes and skins for Google, Facebook, YouTube, Tumblr, and many, many other sites. You can even customize Firefox and other programs themselves.

Rated 4 out of 5 stars (898)
14,840 weekly downloads

Tab Mix Plus Requires Restart

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.

Rated 4 out of 5 stars (2,435)
13,454 weekly downloads

Easy Access Requires Restart

Allow an easy access to the system commands and other programs in your computer.

Rated 4 out of 5 stars (16)
11,544 weekly downloads

Classic Theme Restorer Requires Restart

Squared tabs, appmenu, add-on bar, small button view and many more 'old' features for Firefox 29-56 (Windows / MacOSX / Linux).

Release builds
Beta builds

Rated 5 out of 5 stars (1,110)
9,323 weekly downloads

Dark YouTube Theme Compatible with Firefox 57+ Featured

Shut down the lights on YouTube.
Enjoy!

Rated 4 out of 5 stars (120)
8,333 weekly downloads

Reddit Enhancement Suite Compatible with Firefox 57+

NOTE: Reddit Enhancement Suite is developed independently, and is not officially endorsed by or affiliated with reddit.

RES is a suite of tools to enhance your reddit browsing experience.

Rated 5 out of 5 stars (123)
8,247 weekly downloads

adaware ad block

By blocking annoying ads and nosy trackers, adaware ad block nearly doubles your browsing speed! And with the most robust antivirus-level cloud-scanning technology of any ad blocker on the market, you’ll be safe from the latest cyber-threats.

Rated 4 out of 5 stars (67)
7,998 weekly downloads

FireGestures Requires Restart

A customizable mouse gestures extension which enables to execute various commands and user scripts with six types of gestures.

Rated 4 out of 5 stars (891)
6,875 weekly downloads

Turn Off the Lights Compatible with Firefox 57+ Featured

The entire page will be fading to dark, so you can watch the video as if you were in the cinema.

Rated 5 out of 5 stars (295)
5,885 weekly downloads

Theme Font & Size Changer

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.

Rated 5 out of 5 stars (185)
5,883 weekly downloads

Personas Plus

Personas (now known as lightweight themes) are free, easy-to-install "skins" for Firefox. Personas Plus extends that built-in functionality to give you even more control and easier access to new, popular, and your own favorite themes.

Rated 3 out of 5 stars (858)
5,711 weekly downloads

Popup Blocker Compatible with Firefox 57+

Prevents your web browser from opening a new window on top of the content or web site you are viewing. The Addon also supresses unwanted advertisement windows on your screen. The one deciding what consitutes a popup is the user.

Rated 4 out of 5 stars (52)
5,579 weekly downloads

JavaScript on-off applet Requires Restart

Applet for JavaScript simple On/Off

Rated 3 out of 5 stars (8)
5,438 weekly downloads

Dark Background and Light Text

Makes every page (or only pages that you want) to have light text on dark background. Exact colors are customizable.

Rated 5 out of 5 stars (261)
4,611 weekly downloads

Webmail Ad Blocker Compatible with Firefox 57+ Featured

Expand your email area by blocking and removing ads on the right hand side of the screen when using Gmail, Hotmail, Outlook.com and Yahoo Mail.

Rated 4 out of 5 stars (217)
4,349 weekly downloads

Youtube Dark Mode Compatible with Firefox 57+ Featured

Switch youtube to dark mode. Dark mode will help devices save battery and useful for your sleeping. Make donation for us http://www.paypal.me/hoangthanh. Thank you!

Rated 5 out of 5 stars (105)
4,145 weekly downloads

YouTube use Flash Player Compatible with Firefox 57+

Force YouTube to use Flash player over the HTML5 player

Rated 4 out of 5 stars (142)
4,004 weekly downloads

I don't care about cookies Compatible with Firefox 57+

Get rid of annoying cookie warnings from almost all 'infected' websites!

Rated 5 out of 5 stars (194)
3,722 weekly downloads

colorPicker

A very simple extension for learning web page colors. Copy the RGB or Hex color code of any pixel displayed in your browser to the clipboard (in CSS/HTML format). Similar in function to Internet Explorer's color picker.

Rated 4 out of 5 stars (47)
3,679 weekly downloads

Zoom Page Requires Restart

Full featured zoom manager with independent page and image zoom modes. Choose from four zoom modes: Default Zoom, Fit-To-Width, Default Zoom + Site Specific or Fit-To-Width + Site Specific. Button style and zoom levels are fully configurable.

Rated 5 out of 5 stars (161)
3,660 weekly downloads