Violentmonkey provides userscripts support for browsers. It works on browsers with WebExtensions support.

Example Firefox add-ons created using the WebExtensions API

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.

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

A browser extension to copy tabs and links as Markdown

Fast, open and free-to-use new tab page for modern browsers

🔑✅ 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.

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!