Manage and switch between multiple proxies quickly & easily.
55 134 brukarar
DevTools for Redux with actions history, undo and replay.
54 648 brukarar
Stylish - Custom themes for any website
Stylish lets you customize any website with custom user styles (themes for websites). Choose from the largest userstyles library to change the color scheme, background, and skin for Google, Facebook, YouTube and many, many more sites.
51 300 brukarar
Cookie-Editor lets you efficiently create, edit and delete a cookie for the current tab. Perfect for developing, quickly testing or even manually managing your cookies for your privacy.
50 478 brukarar
Selenium IDE is an integrated development environment for Selenium tests. It is implemented as a Firefox extension, and allows you to record, edit, and debug tests.
50 421 brukarar
Easily override the browser's User-Agent string
50 350 brukarar
RESTClient, a debugger for RESTful web services.
RESTClient has been completely rewritten for compatible with Firefox 57. Some functions are still missing (OAuth & OAuth 2.0 authentication).
43 705 brukarar
A replacement for the Java Plugin so Java Applets without graphics continue to work on browsers that no longer support NPAPI plugins. Java's LiveConnect API is emulated — data & method calls can be exchanged, and Java can manipulate the webpage DOM.
37 103 brukarar
Quickly and easily switch between popular user-agent strings.
34 450 brukarar
iMacros for Firefox
Automate Firefox. Record and replay repetitive tasks. If you're tired of manually visiting the same sites, filling out forms, downloading files and extracting data, then iMacros is for you! Save time, effort and money with iMacros browser automation!
34 161 brukarar
34 054 brukarar
WebRTC leaks your actual IP addresses from behind your VPN, by default.
33 292 brukarar
A wrapper for Chengyin Liu's WhatFont tool
32 006 brukarar
View JSON documents in the browser.
30 881 brukarar
Media Converter and Muxer - Audio Tools
Easy to use video and audio converter and muxer written in WebExtension built on top of the well-known FFmpeg converter
30 439 brukarar
Re-enable the possibility to use the context menu on sites that overrides it
29 379 brukarar
A firefox addon allowing the user to enable CORS everywhere by altering http responses. Report issues to the repository, with enough information to reproduce the problem: https://github.com/spenibus/cors-everywhere-firefox-addon/issues
27 199 brukarar
A tool for viewing SAML and WS-Federation messages sent through the browser during single sign-on and single logout.
24 790 brukarar
ImageAssistant Batch Image Downloader
An image extractor for sniffing, analyzing and batch downloading images from web page.
24 050 brukarar
Xdebug Helper for Firefox
This extension is very useful for PHP developers that are using PHP tools with Xdebug support like PHPStorm, Eclipse with PDT, Netbeans and MacGDBp or any other Xdebug compatible profiling tool like KCacheGrind, WinCacheGrind or Webgrind.
23 583 brukarar
WAVE Accessibility Extension
Evaluate web accessibility within the Firefox browser. When activated, the WAVE extension injects icons and indicators into your page to give feedback about accessibility and to facilitate manual evaluation.
20 274 brukarar
Font Finder (revived)
An easy-to-use font inspector to get CSS styles of the selected element
20 164 brukarar
Add and modify the HTTP request headers and response headers. Use ModHeader to: - Add / modify request and response headers - Add / modify cookies - Multi-profile support - Filtering based on URL, tab, or window - Export and share profiles
19 842 brukarar
SeoQuake SEO extension
Accelerate your SEO efforts on the fly. SEOquake is a free plugin for browsers that provides you with key SEO metrics for a specific page, along with other useful tools such as SEO Audit and many others.
19 429 brukarar
Allows URI texts written in webpages to be loaded by double clicks.
19 168 brukarar