Open-source browser-extension software
469 open-source libraries, tools and applications tagged browser-extension, ranked by how closely browser-extension is their primary purpose, then by adoption and maintenance health. Each entry links to a page with sources, use cases and when to choose or avoid it.
469 products, primary matches first, then adoption-weighted; health v2 shown.
| Product | Health v2 | Stars | Maturity |
|---|---|---|---|
| uBlock Origin uBlock Origin is an efficient, wide-spectrum content blocker browser extension for Chromium-based browsers and Firefox. It blocks ads, trac… | 94 | 68563 | active |
| uBlock Origin uBlock Origin is a free, open‑source browser extension that blocks ads, trackers, and malicious scripts. It works on Chromium‑based browser… | 94 | 68563 | active |
| Playwright A Model Context Protocol (MCP) server from Microsoft that exposes Playwright browser automation capabilities to LLMs and MCP clients. It le… | 80 | 37409 | active |
| maboloshi/github-chinese A userscript that fully translates the GitHub interface into Simplified and Traditional Chinese, covering menus, buttons, titles, time elem… | 77 | 36136 | active |
| Refined GitHub Refined GitHub is a browser extension that simplifies the GitHub interface and adds many quality-of-life features. It supports Chrome, Fire… | 96 | 32220 | active |
| CloakBrowser CloakBrowser is a stealth Chromium distribution with 73 source-level C++ fingerprint patches that passes major bot-detection systems like C… | 82 | 32001 | active |
| OpenCLI OpenCLI is a Node.js CLI tool that converts websites, browser sessions, and Electron apps into deterministic command-line interfaces for hu… | 79 | 30380 | active |
| alibaba/page-agent Page Agent is a JavaScript library that embeds an AI GUI agent directly into any web page with a single script, letting users control the i… | 82 | 29343 | active |
| ungoogled-chromium A set of patches, scripts, and configuration that builds Google Chromium without dependency on Google web services or prebuilt binaries. It… | 94 | 27851 | active |
| philc/vimium Vimium is a browser extension that brings Vim-style keyboard navigation to Chrome, Edge, and Firefox. It lets users scroll, open links, fin… | 71 | 27009 | active |
| nextai-translator/nextai-translator A browser extension and cross-platform desktop application that provides translation of selected text using the ChatGPT/OpenAI API. It also… | 93 | 24977 | active |
| Nagi-ovo/voyager Voyager is a browser extension that enhances AI chat interfaces such as Gemini, Claude, ChatGPT and DeepSeek with workflow tools like timel… | 81 | 20422 | active |
| fathyb/carbonyl Carbonyl is a Chromium-based web browser that renders web pages directly inside a terminal, supporting nearly all Web APIs including WebGL,… | 22 | 19508 | active |
| immersive-translate/immersive-translate Immersive Translate is a browser extension that provides bilingual translation of web pages, documents, subtitles, images and more. It supp… | 95 | 19342 | active |
| Ruffle Ruffle is an open‑source Adobe Flash Player emulator written in Rust. It runs natively on desktop operating systems and in browsers via Web… | 99 | 18709 | active |
| SponsorBlock SponsorBlock is an open-source crowdsourced browser extension that automatically skips sponsor segments and other annoying parts (intros, o… | 94 | 13890 | active |
| BrowserOS BrowserOS is an open-source, Chromium-based agentic browser that lets AI agents (Claude Code, Codex, Cursor, MCP agents) drive a real brows… | 82 | 13886 | active |
| Anarios/return-youtube-dislike Return YouTube Dislike is an open-source browser extension for Chrome and Firefox (plus a userscript) that restores the dislike count on Yo… | 95 | 13788 | active |
| mozilla-firefox/firefox Firefox is Mozilla's free and open-source web browser built on the Gecko engine, available for desktop and mobile platforms. It emphasizes … | 69 | 13515 | active |
| MetaMask MetaMask is a self-custodial crypto wallet available as a browser extension (Chrome, Firefox, Brave, Edge, Opera) and mobile app, enabling … | 95 | 13237 | active |
| mozilla-mobile/firefox-ios The official Mozilla monorepo containing Firefox for iOS and Firefox Focus for iOS, full-featured open-source web browsers built in Swift. … | 93 | 13050 | active |
| KISS Translator KISS Translator is an open-source browser extension (plus Greasemonkey/Tampermonkey userscript) that renders bilingual, side-by-side transl… | 96 | 12840 | active |
| daijro/camoufox Camoufox is an open-source anti-detect browser built on Firefox for web scraping and AI agents, with browser fingerprint spoofing and Playw… | 91 | 12641 | active |
| hangwin/mcp-chrome A Chrome extension that acts as a Model Context Protocol (MCP) server, exposing your real Chrome browser—its tabs, login states, and config… | 50 | 12496 | active |
| qutebrowser/qutebrowser qutebrowser is a keyboard-driven, vim-like web browser with a minimal GUI, built with Python and Qt (QtWebEngine). It is free software lice… | 84 | 11704 | active |
| jo-inc/camofox-browser A self-hosted anti-detection browser server for AI agents, wrapping the Camoufox Firefox fork that spoofs fingerprints at the C++ level. It… | 83 | 11663 | active |
| ChatGPTBox-dev/chatGPTBox A browser extension that deeply integrates ChatGPT into your browsing experience across Chrome, Edge, Firefox, Safari, and Android. It prov… | 91 | 10757 | active |
| XIU2/UserScript A collection of personal Tampermonkey/GreasyFork userscripts by X.I.U, including GitHub high-speed download enhancements, AutoPager infinit… | 74 | 10069 | active |
| WebdriverIO WebdriverIO is a browser and mobile automation test framework for Node.js supporting the WebDriver, WebDriver BiDi, and Appium protocols. I… | 96 | 9852 | stable |
| Buster Buster is a browser extension that solves reCAPTCHA challenges by completing their audio challenges using speech recognition. It works on C… | 85 | 9335 | active |
| Violentmonkey Violentmonkey is an open-source userscript manager implemented as a browser extension built on WebExtensions APIs. It lets users install an… | 97 | 8994 | active |
| SimpRead SimpRead (简悦) is a browser extension that provides an immersive, distraction-free reader view for web pages, with site-specific adaptations… | 65 | 8736 | active |
| FluentRead/FluentRead FluentRead is an open-source browser extension that provides bilingual webpage translation, instant selection translation, and image text t… | 94 | 8510 | active |
| Floorp Browser Floorp is a free, open-source web browser built on Mozilla Firefox (Gecko) that adds advanced customization features like workspaces, split… | 95 | 8449 | active |
| Tencent/BrowserSkill BrowserSkill is a CLI (`bsk`) plus browser extension that lets shell-capable AI agents like Cursor, Claude Code, and Codex control your rea… | 79 | 7905 | active |
| Steel Browser Steel Browser is an open-source browser API and sandbox that manages browser sessions, proxies, stealth, and lifecycle so developers can bu… | 86 | 7708 | active |
| ilyhalight/voice-over-translation A userscript/browser extension that adds AI voice-over translation and subtitles to videos on many websites, powered by Yandex services. It… | 99 | 7570 | active |
| LasCC/HackTools HackTools is an all-in-one browser extension for offensive security professionals that bundles penetration testing tools like XSS payloads,… | 23 | 7087 | active |
| victornpb/undiscord Undiscord is a userscript (installable via Tampermonkey, Violentmonkey, or Greasemonkey) that bulk-deletes your own messages in Discord cha… | 53 | 6658 | active |
| iorate/ublacklist uBlacklist is a browser extension that blocks specified sites from appearing in Google and other major search engine results. It supports m… | 99 | 6657 | active |
| Tridactyl Tridactyl is a Firefox WebExtension that replaces the browser's default control mechanism with a Vim-like keyboard-driven interface, inspir… | 76 | 6360 | active |
| BrowserWorks/waterfox Waterfox is a free, open-source web browser built on the Mozilla Firefox/Gecko platform with telemetry and data collection disabled at buil… | 98 | 6352 | active |
| itorr/nbnhhsh A userscript and web tool that translates Chinese pinyin initialism abbreviations (like 'yyds' or 'xswl') used on social platforms into rea… | 77 | 6280 | active |
| hanydd/BilibiliSponsorBlock A browser extension that automatically skips sponsored segments, intros/outros, and like-subscribe reminders in Bilibili videos, ported fro… | 94 | 6243 | active |
| brookhong/Surfingkeys Surfingkeys is a browser extension for Chrome, Firefox, Edge, and Safari that provides Vim-style keyboard navigation and control of the web… | 76 | 6178 | active |
| BrowserAct BrowserAct Skills is a Python-based browser automation CLI designed for AI agents, providing real-browser control with anti-bot evasion (st… | 57 | 6118 | active |
| langren1353/GM_script A collection of Tampermonkey/Greasemonkey userscripts, most notably AC-baidu, which removes redirects and ads from Baidu, Sogou, Google, Bi… | 74 | 6058 | active |
| FilipePS/Traduzir-paginas-web TWP - Translate Web Pages is a browser extension (WebExtension) that translates web pages in real time using Google, Bing, or Yandex transl… | 93 | 6039 | active |
| NirmalScaria/le-git-graph A browser extension that adds a visual git commit graph to the GitHub website via a new 'Commits' tab. It authenticates with GitHub OAuth a… | 62 | 5867 | active |
| omkarcloud/botasaurus Botasaurus is an all-in-one Python web scraping framework with built-in anti-detection, caching, parallelization, and proxy support. It let… | 69 | 5721 | active |
| GargantuaX/gemini-watermark-remover A 100% client-side tool that removes Gemini AI watermarks from images and videos using a mathematically precise Reverse Alpha Blending algo… | 83 | 5662 | active |
| ScriptCat ScriptCat is an open-source browser extension that acts as a userscript manager, fully compatible with Tampermonkey scripts and GM_* APIs. … | 94 | 5533 | active |
| Vue DevTools Vue Devtools is a browser extension (Chrome, Firefox, Edge) plus a standalone Electron app for inspecting and debugging Vue.js applications… | 23 | 24682 | maintenance |
| Mzying2001/CefFlashBrowser A Windows browser application built with CefSharp/WPF that bundles a Flash Player plugin, allowing users to view Flash content on web pages… | 79 | 5414 | active |
| bpc-clone/bpc_chrome_support Support repository for Bypass Paywalls Clean, a browser extension that bypasses paywalls on news sites. The extension itself has moved to g… | 32 | 5265 | active |
| extension-js/extension.js Extension.js is a zero-config framework and CLI for building cross-browser extensions for Chrome, Edge, Firefox, and Safari from a single c… | 95 | 5190 | active |
| QLHazyCoder/FlowPilot FlowPilot is a Chrome sidebar extension for batch-automating ChatGPT/OpenAI, Kiro, and Grok account registration, OAuth authorization, and … | 71 | 5179 | active |
| ClearURLs ClearURLs is a browser extension built on WebExtensions technology that automatically removes tracking parameters (like utm_source) from UR… | 34 | 5062 | active |
| duckduckgo/Android The official DuckDuckGo Android app, a privacy-focused mobile browser and search client written in Kotlin. It blocks trackers, enforces enc… | 95 | 4855 | active |
| quoid/userscripts An open-source userscript manager and editor for Safari, available on macOS and iOS through the App Store. It lets users install, edit, and… | 74 | 4797 | active |
| code-charity/youtube ImprovedTube is an open-source browser extension that adds 300+ tweaks and customization options to YouTube, covering playback speed, quali… | 88 | 4624 | active |
| Vimium C Vimium C is a browser extension that enables fully keyboard-driven web browsing, including link hints, scrolling, tab operations, and an ad… | 48 | 4614 | active |
| AdguardTeam/AdguardBrowserExtension AdGuard Browser Extension is a free, open-source ad blocker for Chrome, Firefox, Opera, Edge, and other Chromium-based browsers. It blocks … | 98 | 4482 | active |
| igrigorik/videospeed A Chrome browser extension that controls the playback speed of any HTML5 video or audio element on any website. It offers fine-grained spee… | 96 | 4462 | active |
| keleus/BewlyCat BewlyCat is a browser extension for Bilibili, forked from BewlyBewly, that redesigns the Bilibili homepage and adds player and navigation e… | 84 | 4456 | active |
| VonChange/utao Utao TV (油桃TV, now upgraded to 土拨鼠浏览器) is a third-party browser designed for Android TV boxes and smart TVs that lets users watch live CCTV… | 64 | 4418 | active |
| cavi-au/Consent-O-Matic Consent-O-Matic is an open-source browser extension that automatically fills out cookie consent popups according to your saved preferences.… | 49 | 4268 | active |
| OhMyGuus/I-Still-Dont-Care-About-Cookies A debloated, community-maintained fork of the 'I don't care about cookies' browser extension that automatically hides or dismisses cookie c… | 84 | 4264 | active |
| adlered/CSDNGreener CSDNGreener is a Tampermonkey/Violentmonkey userscript that cleans up the CSDN website by removing ads, enabling copy without login, fixing… | 76 | 4260 | active |
| zhom/donutbrowser Donut Browser is an open-source anti-detect desktop browser for macOS, Windows, and Linux that creates unlimited isolated browser profiles,… | 83 | 4088 | active |
| libredirect/browser_extension LibRedirect is a browser extension (WebExtension) that automatically redirects requests to popular sites like YouTube, Twitter, Reddit, Ins… | 87 | 4081 | active |
| ipcjs/oh-my-userscripts A collection of Tampermonkey/Greasyfork userscripts by ipcjs that tweak and enhance websites like Bilibili, Zhihu, Bangumi, S1, and Google.… | 77 | 4065 | active |
| remorses/playwriter Playwriter is a Chrome extension plus CLI/MCP tool that lets AI agents control your real, already-logged-in Chrome browser by executing Pla… | 81 | 3923 | active |
| tuyafeng/Via Via is a lightweight, highly customizable Android web browser built on the system WebView, with built-in ad blocking and per-site configura… | 73 | 3894 | active |
| Privacy Badger Privacy Badger is a free browser extension by EFF that automatically learns to block hidden third-party trackers as you browse. It sends Gl… | 94 | 3865 | active |
| gmail.js Gmail.js is a JavaScript library that provides an unofficial API for interacting with Gmail's web interface from browser extensions. It let… | 77 | 3848 | active |
| piroor/treestyletab Tree Style Tab is a Firefox WebExtensions add-on that displays browser tabs in a vertical sidebar as a tree, automatically nesting tabs ope… | 98 | 3783 | active |
| dessant/search-by-image Search by Image is an open-source browser extension for reverse image search, supporting Chrome, Firefox, Edge, Opera, Safari and Samsung I… | 85 | 3783 | active |
| xxxily/h5player h5player is a Tampermonkey userscript that enhances HTML5 video playback on virtually any website with a video tag, including YouTube, TikT… | 73 | 3771 | active |
| EhTagTranslation/EhSyringe A browser extension and userscript that injects Chinese translations into the E-Hentai website, translating tags and most of the site's UI.… | 98 | 3735 | active |
| oblador/hush Hush is a free, open-source Safari content blocker for iOS and macOS that blocks cookie consent banners and privacy-invasive tracking scrip… | 62 | 3704 | active |
| Emacs Application Framework (EAF) Emacs Application Framework (EAF) is an extensible framework that brings modern graphical capabilities to Emacs by bridging Emacs Lisp with… | 73 | 3489 | active |
| OCS 网课助手 OCS (Online Course Script) is a userscript and companion Electron desktop app that automates online course tasks for Chinese university e-l… | 88 | 3484 | active |
| tulios/json-viewer A Chrome browser extension that pretty-prints and syntax-highlights JSON and JSONP responses directly in the browser. It offers 27 themes, … | 32 | 3455 | active |
| OpenBiliClaw OpenBiliClaw is a local-first, open-source AI content discovery agent that builds a private user profile from cross-platform usage, feedbac… | 78 | 3409 | active |
| NeverDecaf/chromium-web-store A browser extension that enables installing extensions directly from the Chrome Web Store on ungoogled-chromium and other Chromium forks la… | 90 | 3282 | active |
| pasky/chrome-cdp-skill A CLI tool and AI agent skill that connects AI agents to your live Chrome session via the Chrome DevTools Protocol, letting them read, scre… | 60 | 3269 | active |
| mozilla/multi-account-containers A Firefox browser extension by Mozilla that separates browsing into color-coded containers with isolated cookie storage, letting users run … | 86 | 3146 | active |
| filips123/PWAsForFirefox A tool that installs, manages, and runs Progressive Web Apps (PWAs) in Mozilla Firefox as standalone desktop apps. It combines a Firefox br… | 99 | 3129 | active |
| Selenium Selenium IDE is an open-source record-and-playback test automation tool for the web, available as a Chrome/Firefox browser extension and an… | 49 | 3111 | active |
| 0xCUB3/wBlock wBlock is an open-source, next-generation ad blocker built as Safari content-blocking extensions for macOS, iOS, iPadOS, and visionOS. It s… | 91 | 3075 | active |
| bpc-clone/bpc_firefox_support Support and issue-tracking repository for Bypass Paywalls Clean, a Firefox browser extension that bypasses news site paywalls. Development … | 32 | 3058 | active |
| web-scrobbler/web-scrobbler Web Scrobbler is a browser extension that scrobbles music playback history from streaming sites to services like Last.fm, Libre.fm, ListenB… | 92 | 3049 | active |
| MALSync/MALSync MAL-Sync is a browser extension and userscript that integrates MyAnimeList, AniList, Kitsu, Simkl, Shikimori, and MangaBaka into hundreds o… | 93 | 3012 | active |
| Eanya-Tonic/CCTV_Viewer An Android TV / set-top-box browser app for watching web-based live TV channels (CCTV and provincial satellite channels in China) with a re… | 24 | 2959 | active |
| xiao-zaiyi/illa-helper A browser extension that helps users learn languages naturally while browsing the web, based on the comprehensible input theory. It provide… | 73 | 2899 | active |
| besuper/TwitchNoSub A browser extension for Chrome, Chromium-based browsers, and Firefox that lets users watch subscriber-only VODs (past broadcasts) on Twitch… | 73 | 2813 | active |
| prasmussen/chrome-cli chrome-cli is a native macOS command line utility for controlling Google Chrome and compatible browsers (Brave, Edge, Arc, Vivaldi, etc.) v… | 48 | 2812 | active |
| anghunk/linuxdo-scripts A feature-rich browser extension for enhancing the LinuxDo forum experience, offering UI optimizations and AI-assisted features. It is publ… | 83 | 2805 | active |
| polywock/globalSpeed Global Speed is a browser extension that provides universal speed control for video and audio across websites like YouTube, Netflix, and Sp… | 97 | 2752 | active |
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