Web Development

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Stylus (Beta) Compatible with Firefox 57+

Redesign the web with Stylus, a user styles manager. Stylus allows you to
easily install themes and skins for many popular sites.

Rated 4 out of 5 stars (27)
2,625 users

Violentmonkey Compatible with Firefox 57+

Violentmonkey provides userscripts support for browsers.

Rated 4 out of 5 stars (29)
2,411 users

User Agent Switcher Compatible with Firefox 57+

Easily override the browser's User-Agent string

Rated 4 out of 5 stars (21)
4,676 users

EditThisCookie Compatible with Firefox 57+

EditThisCookie is a cookie manager. You can add, delete, edit, search, protect and block cookies!

Rated 4 out of 5 stars (2)
1,355 users

JavaScript Toggle On and Off (WebExtension) Compatible with Firefox 57+

Toggle JavaScript engine on and off the easy way

Rated 4 out of 5 stars (9)
1,865 users

Extended Statusbar

A Statusbar with speed, percentage, time and loaded size (similar to Opera's one)

Rated 4 out of 5 stars (248)
57,355 users

Vue.js devtools Compatible with Firefox 57+

DevTools extension for debugging Vue.js applications.

Rated 5 out of 5 stars (20)
2,507 users

Hackbar. Requires Restart

修改了浮夸的界面,爱护眼睛才是第一.感谢r0oth3x49升级!By Darkmelody.

Rated 3 out of 5 stars (2)
1,889 users

Open in Tor Browser Compatible with Firefox 57+

Open current page or link in tor browser for better privacy

Rated 4 out of 5 stars (41)
4,285 users

Media Converter and Muxer (WebExtension) Compatible with Firefox 57+

Easy to use video and audio converter and muxer written in WebExtension built on top of the well-known FFmpeg converter

Rated 4 out of 5 stars (2)
1,709 users

CORS Everywhere Compatible with Firefox 57+

This is a firefox addon that allows the user to enable CORS everywhere by altering http responses.

Rated 4 out of 5 stars (14)
9,830 users

FireMath Requires Restart

FireMath is an equation editor based on MathML, the mathematical markup language.

Find examples, FAQ, installation instructions and a discussion board at
http://www.firemath.info

Speed up scientific scripting! Improve your science!

Rated 4 out of 5 stars (11)
1,854 users

~/@H3LL4R_H5H HackMod Requires Restart

Thanks To Team HSH And Others , k4jji , tPr0 And Other Hackers For Giving Their Submissions To This Work ! :D .
With Regards - HSH

Rated 5 out of 5 stars (3)
978 users

Modify Header Value (HTTP Headers) Compatible with Firefox 57+

Add, modify or remove a header for any request on desired domains.

Rated 4 out of 5 stars (6)
2,584 users

Custom User-Agent

Add a custom useragent string for desired URLs or domains.

Rated 4 out of 5 stars (12)
1,995 users

Redux DevTools Compatible with Firefox 57+

DevTools for Redux with actions history, undo and replay.

Rated 5 out of 5 stars (5)
3,006 users

Fake Location

Trick geolocation service.

Rated 4 out of 5 stars (26)
1,420 users

Easy Copy Requires Restart

Copy links to a page with one click, ready to paste anywhere else, eg. emails, blogs, forums and Twitter. Copy a single page, all open tabs or all links on a page.

Rated 4 out of 5 stars (43)
17,272 users

MozRepl Requires Restart

Interactive Javascript Console for Mozilla Applications Developers

Rated 4 out of 5 stars (15)
14,674 users

Canvas Defender Compatible with Firefox 57+

Instead of completely blocking canvas fingerprinting, Canvas Defender add-on creates a unique and persistent noise that hides your real canvas fingerprint. This add-on protects you while browsing both in normal and private mode.

Rated 4 out of 5 stars (21)
3,625 users