Allow Right-Click
Re-enable the possibility to use the context menu on sites that overrides it
55,591 users
Cookie Quick Manager
An addon to manage cookies (view, search, create, edit, remove, backup, restore, protect from deletion and much more). Firefox 57+ is supported.
45,525 users
cookies.txt
Exports all cookies to a Netscape HTTP Cookie File, as used by curl, wget, and youtube-dl, among others.
39,186 users
Disable JavaScript
Adds the ability to disable JavaScript for specific sites or specific tabs. You can customize the default JS state (on or off), the disable behavior (by domain or by tab) and much more.
31,219 users
Nimbus Screen Capture: Screenshot, Edit, Annotate
★ Used by Several Million users on different platforms ★ 1) Screen capture web pages 2) Selected regions 3) Whole browser window 4) Slack upload Edit screenshots. Save images as local files or Google Drive. Tools for Annotation. Upload and share
30,748 users
Selenium IDE
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.
29,896 users
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.
23,709 users
CORS Everywhere
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
21,041 users
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.
20,668 users
SAML-tracer
A tool for viewing SAML and WS-Federation messages sent through the browser during single sign-on and single logout.
20,240 users
ImageAssistant Batch Image Downloader
An image extractor for sniffing, analyzing and batch downloading images from web page.
18,078 users
Font Finder (revived)
An easy-to-use font inspector to get CSS styles of the selected element
17,883 users
Colorpick Eyedropper
A simple eye-dropper & color-picker tool allowing you to select color values from webpages. You will need to enable the add-on bar Firefox menu->Options->Add-on Bar OR View->Toolbars->Add-on Bar Then refresh the page.
16,588 users
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
15,655 users
Google Lighthouse
Lighthouse is an open-source, automated tool for improving the performance, quality, and correctness of your web apps.
14,931 users
