Violentmonkey provides userscripts support for browsers. It works on browsers with WebExtensions support.
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Updated
Jun 30, 2025 - JavaScript
Universal standard for creating browser extensions.
Working through a W3C charter group, Mozilla has partnered with Microsoft and Opera to define a browser extension API that works across multiple browsers.
There is currently a preliminary specification that matches what Google has implemented in Chrome so that extensions written to the specification could potentially work on Chrome, Edge, Opera and Firefox.
Violentmonkey provides userscripts support for browsers. It works on browsers with WebExtensions support.
ClearURLs is an add-on based on the new WebExtensions technology and will automatically remove tracking elements from URLs to help protect your privacy.
🧩 The cross-browser extension framework.
Example Firefox add-ons created using the WebExtensions API
Tree Style Tab, Show tabs like a tree.
⚡️ A template for building cross browser extensions for Chrome, Opera & Firefox.
A command line tool to help build, run, and test web extensions
Firefox/Chrome browser extension. SmartProxy will automatically enable/disable proxy for the sites you visit, based on customizable patterns.
An awesome browser extension that reads aloud webpage content with one click
A browser extension that deletes your news feed and replaces it with a nice quote
Save a web page/selection as an eBook (.epub format) - a Chrome/Firefox/Opera Web Extension
The DownThemAll! WebExtension
Firefox extension to save and restore tabs as bookmarks. Clear your tabs, clear your mind.
📕 Barebones boilerplate with Parcel 2, options handler and auto-publishing
ArrowDL (Arrow Downloader) is a download manager for Windows, MacOS and Linux
Fast, open and free-to-use new tab page for modern browsers
A browser extension to copy tabs and links as Markdown
Chrome/Firefox extension for pen-testing to retrieve encryption keys of Widevine protected content !DON'T DECRYPT CONTENT UNLESS YOU HAVE THE RIGHT TO DO IT!
🔑✅ An alternative to Twitter's verified accounts powered by Keybase.
Kee adds free, secure and easy password management features to your browser which save time and keep your private data more secure.
Created by Browser Extension Community Group
Released May 7, 2015