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WebExtension

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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.

Here are 2,425 public repositories matching this topic...

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All 2,425 JavaScript 1,596 TypeScript 531 HTML 54 CSS 46 Python 31 Shell 17 Vue 16 Rust 15 Svelte 10 Go 7
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clients

bitwarden / clients

Star 14.2k

Bitwarden client apps (web, browser extension, desktop, and cli).

electron nodejs javascript cli firefox chrome angular typescript desktop safari webextension browser-extension bitwarden
  • Updated Nov 12, 2026
  • TypeScript
ext-saladict

crimx / ext-saladict

Star 13.4k

🥗 All-in-one professional pop-up dictionary and page translator which supports multiple search modes, page translations, new word notebook and PDF selection searching.

react chrome-extension firefox chrome typescript rxjs extension dictionaries firefox-addon webextension firefox-extension saladict
  • Updated Nov 6, 2026
  • TypeScript
floccus

floccusaddon / floccus

Star 8.6k

☁️ Sync your bookmarks privately across browsers and devices

chrome-extension firefox sync chrome firefox-addon bookmark nextcloud owncloud webdav bookmarks webextension firefox-extension browser-bookmarks edge-extension syncing-bookmarks nextcloud-bookmarks sync-solution
  • Updated Nov 12, 2026
  • TypeScript

iorate / ublacklist

Star 6.7k

Blocks specific sites from appearing in Google search results

chrome-extension search-engine safari-extension firefox-addon blocklist webextension browser-extension blocker google-search edge-addon
  • Updated Nov 8, 2026
  • TypeScript

tridactyl / tridactyl

Star 6.4k

A Vim-like interface for Firefox, inspired by Vimperator/Pentadactyl.

vim firefox webextension hacktoberfest
  • Updated Nov 10, 2026
  • TypeScript

FilipePS / Traduzir-paginas-web

Star 6.1k

Translate your page in real time using Google, Bing or Yandex

pages firefox chrome google translation site webextension edge translate addons traduzir
  • Updated Oct 29, 2026
  • JavaScript

scriptscat / scriptcat

Star 5.9k

ScriptCat, a browser extension that can execute userscript; 脚本猫,一个可以执行用户脚本的浏览器扩展

chrome-extension userscript webextension greasemonkey-userscript scriptcat
  • Updated Nov 12, 2026
  • TypeScript
extension.js

extension-js / extension.js

Star 5.2k

The cross-browser extension framework.

react chrome-extension typescript vue preact firefox-addon hmr svelte webextension dev-server firefox-extension cross-browser build-tool browser-extension web-extension chrome-extensions zero-config edge-extension manifest-v3 safari-web-extension
  • Updated Nov 12, 2026
  • TypeScript
Authenticator

Authenticator-Extension / Authenticator

Star 4.8k

Authenticator generates 2-Step Verification codes in your browser.

chrome-extension otp firefox-addon webextension authenticator edge-extension 2fa
  • Updated Nov 10, 2026
  • TypeScript
youtube

code-charity / youtube

Star 4.7k

YouTube (Video) Browser-Extension. [Top1 FOSS.] Enrich your experience & choice! 🧰Smart features📌set & forget📌100s of tweaks. Longest-standing. Join🧩us?👨‍👩‍👧‍👧 ⋮ ⋮ ⋮ ⋮ ⋮ {playback|discovery|extra player buttons|quality|codec|full tab|full screen|no distraction|shorts}

chrome-extension productivity player youtube extension video addon css3 youtube-api webextension subtitles entertainment youtube-playlist youtube-channel youtube-player playback-speed
  • Updated Nov 10, 2026
  • JavaScript

gdh1995 / vimium-c

Star 4.7k

A keyboard shortcut browser extension for keyboard-based navigation and tab operations with an advanced omnibar

chrome-extension keyboard-shortcut webextension edge-extension vimium firefox-webextension keyboard-assistance
  • Updated Feb 3, 2026
  • TypeScript

libredirect / browser_extension

Sponsor
Star 4.1k

A browser extension that redirects popular sites to alternative privacy friendly frontends

chrome-extension youtube privacy twitter webextension quora firefox-extension libre invidious nitter bibliogram
  • Updated Nov 10, 2026
  • JSON
privacybadger

EFForg / privacybadger

Star 3.9k

Privacy Badger is a browser extension made by EFF to stop companies from spying on you online

javascript chrome-extension tracking privacy cookies webextension firefox-extension fingerprinting browser-fingerprinting
  • Updated Nov 11, 2026
  • JavaScript

antfu-collective / vitesse-webext

Star 3.4k

⚡️ WebExtension Vite Starter Template

webextension vue3 vite
  • Updated Mar 3, 2026
  • TypeScript

mozilla / multi-account-containers

Star 3.2k

Firefox Multi-Account Containers lets you keep parts of your online life separated into color-coded tabs that preserve your privacy. Cookies are separated by container, allowing you to use the web with multiple identities or accounts simultaneously.

firefox webextension
  • Updated Oct 16, 2026
  • JavaScript

mozilla / web-ext

Star 3.2k

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

javascript webextension webextensions browser-extension add-ons
  • Updated Nov 10, 2026
  • JavaScript
selenium-ide

SeleniumHQ / selenium-ide

Sponsor
Star 3.1k

Open Source record and playback test automation for the web.

electron webdriver selenium webextension playback record selenium-ide
  • Updated Nov 11, 2026
  • TypeScript
web-scrobbler

web-scrobbler / web-scrobbler

Star 3.1k

Scrobble music all around the web!

chrome-extension safari-extension firefox-addon lastfm webextension hacktoberfest librefm listenbrainz edge-addon
  • Updated Nov 11, 2026
  • TypeScript
tabliss

joelshepherd / tabliss

Star 2.8k

A beautiful, customisable New Tab page for Firefox, Chrome, and Edge.

chrome-extension typescript firefox-addon webextension browser-extension
  • Updated Aug 19, 2024
  • TypeScript

salarcode / SmartProxy

Star 2.8k

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
  • Updated Nov 12, 2026
  • TypeScript

Created by Browser Extension Community Group

Released May 7, 2015

Followers
307 followers
Website
github.com/topics/webextension

Related topics

browser chrome chrome-extension edge firefox firefox-extension mozilla opera w3c
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