Custom UserAgent String No Restart
Add a custom useragent string for desired URLs or domains.
about:addons-memory 2016 No Restart
Adds a new page that shows add-on memory usage
RESTer No Restart
A REST client for almost any web service.
Octotree No Restart
Add-on to display GitHub code in tree format
Page Source places an add-on bar button that open the Page Source qucikly.
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...
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.
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.
RESTED No Restart
A REST client for the rest of us
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.
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.
Custom User-Agent String No Restart
Set custom User-Agent string. Also available for Firefox on Android.
WebRTC Control No Restart
Have control over WebRTC (disable or enable) and protect your IP address.
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.
Create automated cross-browser functional tests easily and quickly.
Fontface Ninja No Restart
Explore fonts within a website, try and buy them !
this add-on simulates japanese mobile device.
this add-on support DoCoMo, Au(KDDI) and SoftBank device.