Open-source browser-extensions software
537 open-source libraries, tools and applications tagged browser-extensions, ranked by how closely browser-extensions 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.
537 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 |
| adam-p/markdown-here Markdown Here is a browser and email-client extension (Chrome, Firefox, Opera, Safari, Thunderbird, Postbox) that lets users write email in… | 48 | 60265 | 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 |
| the1812/Bilibili-Evolved A powerful userscript that enhances the Bilibili video website with a modular component system for features like UI tweaks, video downloadi… | 93 | 30628 | 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 |
| 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 |
| hmjz100/LinkSwift A Tampermonkey userscript that extracts direct download links from major Chinese cloud storage services (Baidu Netdisk, Aliyun Drive, China… | 84 | 22948 | active |
| SingleFile SingleFile is an open-source browser extension for Chrome, Edge, Firefox, and Safari that saves an entire web page - including images, styl… | 99 | 22606 | stable |
| js-cookie/js-cookie js-cookie is a simple, lightweight JavaScript library for reading, writing, and deleting browser cookies on the client side. It is RFC 6265… | 92 | 22567 | stable |
| darkreader/darkreader Dark Reader is an open-source MIT-licensed browser extension that analyzes web pages and generates a customizable dark mode to reduce eyest… | 98 | 22455 | active |
| cat-catch Cat-catch is an open-source browser extension that sniffs and lists media resources (video, audio, images) loaded by the current web page. … | 90 | 22129 | active |
| AutomaApp/automa Automa is a browser extension for Chrome and Firefox that lets users automate browser tasks by visually connecting blocks into workflows. I… | 62 | 21649 | 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 |
| citrolabs/ego-lite ego (lite) is a Chromium-based macOS browser designed to be shared between a human user and AI coding agents like Claude Code, Codex, and C… | 80 | 17025 | 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 |
| nanobrowser/nanobrowser Nanobrowser is an open-source Chrome extension that provides AI-powered web automation through a multi-agent system (Planner, Navigator, et… | 67 | 13818 | 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 |
| crimx/ext-saladict Saladict is an open-source Chrome/Firefox WebExtension providing an all-in-one pop-up dictionary and page translator with multiple search m… | 97 | 13365 | 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 |
| Plasmo Framework Plasmo is an open-source framework and SDK for building browser extensions with React and TypeScript. It handles bundling, manifest generat… | 69 | 13158 | 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 |
| 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 |
| NopeCHA NopeCHA is an AI-powered CAPTCHA solving service distributed as a browser extension (Chrome/Firefox/Edge) plus Python and Node.js client li… | 87 | 10997 | 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 |
| wxt-dev/wxt WXT is a TypeScript framework for building web browser extensions, described as 'like Nuxt, but for Web Extensions'. It provides file-based… | 88 | 10562 | active |
| mengxi-ream/read-frog Read Frog is an open-source AI-powered browser extension for language learning and immersive translation. It translates web pages, selected… | 84 | 10112 | 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 |
| StylishThemes/GitHub-Dark A dark theme userstyle (user.css) for the GitHub website, applied via the Stylus browser extension. It restyles GitHub's interface with a d… | 77 | 9987 | active |
| 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 |
| BewlyBewly/BewlyBewly BewlyBewly is a browser extension that redesigns the Bilibili homepage with a modern UI inspired by YouTube, Vision OS, and iOS, including … | 10 | 8809 | 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 |
| std-microblock/chromatic Chromatic is a universal modifier that injects into Chromium/V8-based applications (successor to BetterNCM), enabling runtime modification … | 53 | 8455 | active |
| n4ze3m/page-assist Page Assist is an open-source browser extension that adds a sidebar and web UI for interacting with locally running AI models like Ollama f… | 91 | 8225 | 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 |
| 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 |
| mozilla/geckodriver geckodriver is a standalone proxy that exposes the W3C WebDriver protocol over HTTP and translates those calls into Firefox's Marionette re… | 80 | 7477 | stable |
| RSSHub RSSHub Radar is a browser extension that helps users quickly discover RSS and RSSHub feeds available on the web pages they visit. It simpli… | 72 | 7366 | active |
| BrowserMCP/mcp Browser MCP is an MCP server plus Chrome extension that lets AI applications like Claude, Cursor, VS Code, and Windsurf control the user's … | 25 | 7171 | active |
| openstyles/stylus Stylus is a browser extension for Chrome, Firefox, and Chromium-based browsers that lets users restyle websites by installing and managing … | 96 | 6898 | active |
| webclipper/web-clipper Web Clipper is an open-source browser extension that saves web content to many note-taking platforms such as Notion, OneNote, Obsidian, Bea… | 43 | 6856 | 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 |
| 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 |
| glacambre/firenvim Firenvim is a browser extension plus Neovim plugin that embeds a Neovim client inside Firefox and Chrome, replacing textareas with a full N… | 77 | 6150 | 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 |
| Tampermonkey/tampermonkey Tampermonkey is the most popular userscript manager, available as a browser extension for Chrome, Edge, Safari, Opera, and Firefox. It lets… | 35 | 5765 | active |
| Pixiv Batch Downloader A browser extension (Chrome, Edge, Firefox) for batch downloading illustrations, manga, Ugoira animations, and novels from Pixiv. It offers… | 97 | 5664 | active |
| Modernizr Modernizr is a JavaScript library that detects which HTML5 and CSS3 features are supported in the user's browser. It exposes results as pro… | 65 | 25681 | maintenance |
| Neet-Nestor/Telegram-Media-Downloader A browser userscript (installable via Tampermonkey, Violentmonkey, etc.) that adds media download buttons to the Telegram webapp. It enable… | 61 | 5555 | 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 |
| 88lin/video_vip A Tampermonkey/Greasemonkey userscript that integrates multiple third-party parsing interfaces to bypass VIP membership restrictions on Chi… | 64 | 5531 | 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 |
| ovity/octotree Octotree is a browser extension that enhances GitHub by adding a code file tree sidebar for easier code exploration and review. This reposi… | 32 | 23257 | maintenance |
| ClearURLs ClearURLs is a browser extension built on WebExtensions technology that automatically removes tracking parameters (like utm_source) from UR… | 34 | 5062 | active |
| Notion Enhancer notion-enhancer is a mod loader and customiser for the Notion productivity workspace, adding features like in-app tabs, colour themes, side… | 50 | 5021 | active |
| davidarroyo1234/InstagramUnfollowers A browser-based script that scans your Instagram account to identify users who don't follow you back, letting you selectively unfollow them… | 76 | 4935 | 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 |
| WorldBrain/Memex Memex is a browser extension (Chrome/Firefox) for curating, annotating, highlighting, tagging, and full-text searching web content and PDFs… | 44 | 4722 | active |
| Authenticator A browser extension that generates two-factor authentication (2FA) codes, acting as a software TOTP authenticator. It is available for Chro… | 66 | 4705 | active |
| mbnuqw/sidebery Sidebery is a Firefox browser extension that provides a highly configurable sidebar for managing tabs and bookmarks. It supports vertical t… | 89 | 4690 | 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 |
| syhyz1990/baiduyun A free open-source Tampermonkey userscript that extracts real direct download links from Chinese cloud storage services (Baidu Netdisk, Ali… | 32 | 4571 | active |
| cyrus-and/chrome-remote-interface A Node.js library providing a JavaScript interface to the Chrome Debugging Protocol (CDP). It abstracts CDP domains into commands and event… | 58 | 4556 | stable |
| limbopro/Adblock4limbo A userscript-based ad-blocking project that removes popups, banners, and video ads on specific streaming, comic, novel, and adult sites via… | 77 | 4542 | active |
| MrOtherGuy/firefox-csshacks A collection of self-contained CSS stylesheets (userChrome.css/userContent.css hacks) for customizing the appearance of Mozilla Firefox. Us… | 75 | 4519 | 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 |
| hoothin/UserScripts A collection of Greasemonkey/Tampermonkey userscripts by hoothin, including Pagetual (auto-pager infinite scrolling), Picviewer CE+ (online… | 76 | 4329 | 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 |
| crxjs/chrome-extension-tools CRXJS is a set of Vite and Rollup plugins for building cross-browser extensions with native hot module replacement and zero-config setup. I… | 93 | 4180 | active |
| 027xiguapi/code-box CodeBox is a browser extension for Chrome, Edge, Firefox, and 360 browsers that enhances Chinese tech blog sites like CSDN, Zhihu, Juejin, … | 57 | 4150 | active |
| hcfyapp/crx-selection-translate Huaci Fanyi (Selection Translate) is a browser extension for Chrome, Edge, and Firefox that translates selected text, full web pages, scree… | 32 | 4140 | 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 |
| 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 |
| uBlock Origin uBO Lite is an efficient, permission-free content blocker browser extension built on the Manifest V3 API, from the uBlock Origin team. It o… | 93 | 3836 | 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 |
| 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 |
| justjavac/ReplaceGoogleCDN A Chrome browser extension that redirects requests to Google CDNs (fonts, libraries, reCAPTCHA, Gravatar) to China-accessible mirror domain… | 60 | 3697 | active |
| fregante/GhostText GhostText is a browser extension plus editor plugin system that lets you write text in your preferred editor (VS Code, Sublime Text, Vim, E… | 69 | 3645 | 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 |
| x2rr/funds A Chrome browser extension for tracking Chinese mutual funds, showing real-time fund valuations, gains/losses, and portfolio returns in a c… | 89 | 3226 | active |
page 1 / 6 next →