WebExtension

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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crimx /ext-saladict

Star13k

🥗 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

UpdatedOct 8, 2025
TypeScript

bitwarden /clients

Star12.3k

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

electron nodejs javascript cli firefox chrome angular typescript desktop safari webextension browser-extension bitwarden

UpdatedFeb 20, 2026
TypeScript

floccusaddon /floccus

Star7.7k

☁️ 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

UpdatedFeb 18, 2026
JavaScript

tridactyl /tridactyl

Star6.1k

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

vim firefox webextension hacktoberfest

UpdatedFeb 19, 2026
TypeScript

FilipePS /Traduzir-paginas-web

Star5.6k

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

pages firefox chrome google translation site webextension edge translate addons traduzir

UpdatedFeb 14, 2026
JavaScript

extension-js /extension.js

Star4.8k

🧩 The cross-browser extension framework

react chrome-extension cli boilerplate typescript vue preact firefox-addon scaffold svelte starter-template webextension cross-browser browser-extension zero-config edge-extension playwright manifest-v3 mv3 safari-web-extension

UpdatedFeb 20, 2026
TypeScript

Authenticator-Extension /Authenticator

Star4.4k

Authenticator generates 2-Step Verification codes in your browser.

chrome-extension otp firefox-addon webextension authenticator edge-extension 2fa

UpdatedFeb 10, 2026
TypeScript

gdh1995 /vimium-c

Star4.3k

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

UpdatedFeb 3, 2026
TypeScript

code-charity /youtube

Star4.2k

Open YouTube / Video browser-extension [top~1] Enrich your experience&choice!🧰250+tweaks; smart features📌set&forget📌 - 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

UpdatedFeb 18, 2026
JavaScript

scriptscat /scriptcat

Star4.1k

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

UpdatedFeb 19, 2026
TypeScript

libredirect /browser_extension

Sponsor

Star3.8k

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

UpdatedJan 12, 2026
JavaScript

EFForg /privacybadger

Star3.7k

Privacy Badger is a browser extension that automatically learns to block hidden trackers

javascript chrome-extension tracking privacy cookies webextension firefox-extension fingerprinting browser-fingerprinting

UpdatedFeb 20, 2026
JavaScript

antfu-collective /vitesse-webext

Star3.4k

⚡️ WebExtension Vite Starter Template

webextension vue3 vite

UpdatedJul 4, 2025
TypeScript

SeleniumHQ /selenium-ide

Sponsor

Star3.1k

Open Source record and playback test automation for the web.

electron webdriver selenium webextension playback record selenium-ide

UpdatedFeb 6, 2026
TypeScript

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

mozilla /multi-account-containers

Star3k

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