webextensions

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.

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violentmonkey /violentmonkey

Star7.9k

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

webextensions violentmonkey userscripts-support

UpdatedFeb 19, 2026
JavaScript

ClearURLs /Addon

Star4.7k

ClearURLs is an add-on based on the new WebExtensions technology and will automatically remove tracking elements from URLs to help protect your privacy.

firefox security chrome privacy addon webextensions addons-mozilla-org tracking-protection anti-tracking

UpdatedJul 27, 2025
JavaScript

mdn /webextensions-examples

Star4.4k

Example Firefox add-ons created using the WebExtensions API

browser mdn webextensions webextensions-apis

UpdatedFeb 16, 2026
JavaScript

piroor /treestyletab

Star3.7k

Tree Style Tab, Show tabs like a tree.

javascript firefox firefox-addon addon webextensions sidebar hacktoberfest vertical-tabs tree-tabs

UpdatedFeb 20, 2026
JavaScript

EmailThis /extension-boilerplate

Star3.3k

⚡️ A template for building cross browser extensions for Chrome, Opera & Firefox.

gulp chrome-extension es6 firefox-addon extensions boilerplate-template webextensions opera-extension

UpdatedMay 2, 2024
JavaScript

mozilla /web-ext

Star3k

A command line tool to help build, run, and test web extensions

javascript webextension webextensions browser-extension add-ons

UpdatedFeb 20, 2026
JavaScript

salarcode /SmartProxy

Star2.6k

Firefox/Chrome browser extension. SmartProxy will automatically enable/disable proxy for the sites you visit, based on customizable patterns.

chrome-extension firefox chrome firefox-addon proxy webextension webextensions firefox-extension browser-extension proxy-list edge-extension proxy-switcher

UpdatedFeb 18, 2026
TypeScript

ken107 /read-aloud

Star1.6k

An awesome browser extension that reads aloud webpage content with one click

chrome-extension text-to-speech firefox-addon accessibility webextension webextensions firefox-extension browser-extension chrome-extensions edge-extension browser-addon firefox-extensions chromium-extension page-reader

UpdatedFeb 6, 2026
JavaScript

jordwest /news-feed-eradicator

Star1.4k

A browser extension that deletes your news feed and replaces it with a nice quote

firefox chrome webextensions browser-extension

UpdatedFeb 13, 2026
TypeScript

alexadam /save-as-ebook

Star1.1k

Save a web page/selection as an eBook (.epub format) - a Chrome/Firefox/Opera Web Extension

productivity ebook webextension webextensions epub ebooks epub-format

UpdatedFeb 26, 2022
JavaScript

downthemall /downthemall

Star1.1k

The DownThemAll! WebExtension

firefox downloader download mozilla webextension webextensions download-manager

UpdatedNov 30, 2025
TypeScript

josh-berry /tab-stash

Sponsor

Star991

Firefox extension to save and restore tabs as bookmarks. Clear your tabs, clear your mind.

firefox firefox-addon bookmark tabs webextensions sidebar firefox-extension bookmark-manager tabs-management firefox-webextension tab-stash

UpdatedFeb 20, 2026
TypeScript

fregante /browser-extension-template

Sponsor

Star841

📕 Barebones boilerplate with Parcel 2, options handler and auto-publishing

chrome-extension parcel webextensions firefox-extension browser-extension github-template

UpdatedFeb 3, 2025
JavaScript

setvisible /ArrowDL

Star832

ArrowDL (Arrow Downloader) is a download manager for Windows, MacOS and Linux

crawler streaming qt download youtube-dl video-downloader webextensions magnet-link torrent-client youtube-downloader torrent-downloader libtorrent mozilla-firefox download-manager stream-downloader batch-download mass-downloader picture-download web-engine nativeclient

UpdatedMar 23, 2025
C++

FoxRefire /wvg

Sponsor

Star719

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!