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Custom UserAgent String No Restart

Add a custom useragent string for desired URLs or domains.

Rated 4 out of 5 stars (5)
3,813 users

about:addons-memory 2016 No Restart

Adds a new page that shows add-on memory usage

Rated 5 out of 5 stars (12)
4,438 users

Javascript Injector for Firefox No Restart

Customize/tweak the web, the way you like, by adding Javascript codes to websites you want.

Rated 5 out of 5 stars (1)
1,366 users

RESTer No Restart

A REST client for almost any web service.

Rated 5 out of 5 stars (4)
1,188 users

Octotree No Restart

Add-on to display GitHub code in tree format

Rated 5 out of 5 stars (11)
2,438 users

Page Source

Page Source places an add-on bar button that open the Page Source qucikly.

Rated 4 out of 5 stars (3)
1,853 users

Flash Debugger No Restart

Debug Flash/SWF/Flex files on the web. Edit properties and inspect elements on the fly. View log output inside the extension. Run AS3 code against the active SWF. Access assets with the Explorer, profile memory consumption and much much more...

Not yet rated
1,115 users

Emoji Keyboard No Restart Featured

A free Emoji Keyboard extension of the web tool http://emojikeyboard.org. This extension lets you input emojis right on the Firefox web browser of your computer.

Rated 5 out of 5 stars (27)
9,397 users

Set proxy server with one click! No Restart

Set proxy server with one click! Visit Cool-proxy.net, the best resource of proxy servers and set your browser with one click.

Rated 5 out of 5 stars (1)
1,373 users

RESTED No Restart

A REST client for the rest of us

Rated 3 out of 5 stars (5)
6,778 users

WebSocket Monitor No Restart

WebSocket monitor is an extension for Firefox developer tools that can be used to monitor WebSocket connections in Firefox. It allows to inspect all data sent and received.

Rated 5 out of 5 stars (3)
1,704 users

Autofill

Autofill is a small but powerful add-on that serves one purpose: fill form fields automatically on page load. It is for people who just want a straightforward form filler without all the bells and whistles.

Rated 3 out of 5 stars (55)
24,937 users

JavaScript Toggle On and Off No Restart

Toggle JavaScript engine on and off the easy way

Rated 5 out of 5 stars (2)
17,815 users

Custom User-Agent String No Restart

Set custom User-Agent string. Also available for Firefox on Android.

Rated 3 out of 5 stars (8)
27,613 users

WebRTC Control No Restart

Have control over WebRTC (disable or enable) and protect your IP address.

Rated 5 out of 5 stars (2)
3,636 users

Remote XUL Manager No Restart

Manages the Remote XUL whitelist to allow websites and local files to load XUL content. For versions compatible with Firefox 41 and lower, see All Versions page below.

Rated 5 out of 5 stars (36)
81,643 users

Selenium Builder

Create automated cross-browser functional tests easily and quickly.

Rated 5 out of 5 stars (1)
2,916 users

Fontface Ninja No Restart

Explore fonts within a website, try and buy them !

Rated 5 out of 5 stars (1)
1,577 users

FireMobileSimulator

this add-on simulates japanese mobile device.
this add-on support DoCoMo, Au(KDDI) and SoftBank device.

Rated 4 out of 5 stars (11)
44,868 users

Clear Cache and Data No Restart

Clears the browser cache and other selected storage.

Rated 5 out of 5 stars (2)
4,792 users