Open-source browser-extension software
595 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.
595 products, primary matches first, then adoption-weighted; health v2 shown.
| Product | Health v2 | Stars | Maturity |
|---|---|---|---|
| Obsidian Obsidian Web Clipper is the official browser extension for Obsidian that lets users highlight web pages and capture content as durable Mark… | 85 | 5230 | 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 |
| qixing-jk/all-api-hub All API Hub is an open-source browser extension (Chrome, Edge, Firefox, Safari) that acts as an all-in-one manager for AI relay/proxy site … | 80 | 4919 | active |
| pangu Pangu.js is a JavaScript/TypeScript library that automatically inserts spacing between CJK characters and half-width English letters, numbe… | 76 | 4836 | 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 |
| leonhartX/gas-github A Chrome extension that lets you manage Google Apps Script (GAS) code with GitHub, GitHub Enterprise, Bitbucket, or GitLab directly from th… | 24 | 4594 | 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 |
| Rainbow Wallet Rainbow is a self-custody Ethereum wallet app for iOS, Android, and desktop browsers, built with React Native and TypeScript. It lets users… | 95 | 4396 | active |
| QasimWani/LeetHub LeetHub is a browser extension that automatically pushes your LeetCode solutions to GitHub whenever you pass all tests on a problem. It sup… | 68 | 4353 | active |
| hoothin/UserScripts A collection of Greasemonkey/Tampermonkey userscripts by hoothin, including Pagetual (auto-pager infinite scrolling), Picviewer CE+ (online… | 76 | 4329 | active |
| Manavarya09/design-extract designlang is an open-source CLI (npx designlang <url>) that uses a Playwright-driven headless browser to reverse-engineer any website's de… | 81 | 4275 | 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 |
| leetcode-mafia/cheetah Cheetah is a macOS app that provides real-time AI coaching for software engineering interviews. It transcribes conversation audio locally w… | 21 | 4260 | active |
| google/tamperchrome Tamper Dev is a browser extension that intercepts and edits HTTP/HTTPS requests and responses in real time without requiring a proxy or aux… | 50 | 4227 | active |
| RetireJS/retire.js Retire.js is a scanner that detects the use of JavaScript libraries and Node.js modules with known vulnerabilities, available as a CLI scan… | 95 | 4180 | 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 |
| 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 |
| edwardkim/rhwp rhwp is an open-source HWP/HWPX (Korean Hangul word processor format) viewer and editor built with Rust and WebAssembly. It runs in the bro… | 82 | 3966 | 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 |
| dejan/rails_panel RailsPanel is a Chrome extension that shows Rails app request details (db/rendering/total times, parameters, rendered views) directly in Ch… | 70 | 3868 | 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 |
| Omnivore Omnivore is a complete, open source read-it-later application for saving and reading articles, with highlighting, notes, search, labels, PD… | 95 | 16257 | maintenance |
| 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 |
| justjavac/ReplaceGoogleCDN A Chrome browser extension that redirects requests to Google CDNs (fonts, libraries, reCAPTCHA, Gravatar) to China-accessible mirror domain… | 60 | 3697 | active |
| wdcpclover/ai4paper AI4Paper is an AI research workbench delivered primarily as a Zotero 7-10 plugin, with a web app, browser extension, and WeChat mini-progra… | 78 | 3684 | active |
| leaperone/MultiPost-Extension MultiPost is an open-source browser extension (with a companion desktop app) that publishes text, images, videos, and other content to 10+ … | 88 | 3670 | 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 |
| tailwindlabs/tailwindcss-intellisense The official Tailwind CSS IntelliSense extension for Visual Studio Code, providing intelligent tooling for Tailwind utility classes. It off… | 92 | 3473 | 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 |
| 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 |
| Taho Taho is a community-owned Web3 cryptocurrency wallet implemented as a browser extension, positioned as an open-source alternative to MetaMa… | 82 | 3205 | active |
| nilbuild/githunt GitHunt is a React web application and Chrome extension that lets users explore the most starred GitHub projects by week, with filtering by… | 56 | 3189 | active |
| yourselfhosted/slash Slash is an open-source, self-hosted platform for organizing, managing, and sharing links via customizable human-readable shortcuts (e.g., … | 64 | 3185 | active |
| easychen/CookieCloud CookieCloud is a browser extension plus self-hosted server that syncs browser cookies and localStorage across devices with end-to-end encry… | 87 | 3171 | active |
| aliasvault/aliasvault AliasVault is a privacy-first, end-to-end encrypted password manager with a built-in email alias server, letting users create unique identi… | 86 | 3164 | active |
| uku/Unblock-Youku Unblock Youku is an open-source Chrome extension that lets users outside mainland China access Chinese web services such as video and music… | 32 | 3153 | 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 |
| 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 |
| 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 |
| cilame/v_jstools v_jstools is a Chrome extension (Manifest V3) for debugging and reverse-engineering JavaScript on web pages. It provides API hooking, code … | 55 | 3016 | 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 |
| bergside/design-md-chrome A Chrome extension that extracts visual styles (typography, colors, spacing, shadows, motion) from any website and generates DESIGN.md or S… | 62 | 2972 | active |
| ogkalu2/comic-translate An AI-powered application and browser extension that automatically translates comics, manga, manhwa, webtoons, and BDs across many language… | 89 | 2949 | active |
| Vue DevTools Vue DevTools is the official debugging and inspection tool for Vue.js applications, available as a Vite plugin, browser extension, or stand… | 92 | 2927 | 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 |
| Amurex Amurex is an open-source Chrome extension that acts as an AI meeting copilot for Google Meet and MS Teams. It provides real-time suggestion… | 31 | 2873 | 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 |
| DominikDoom/a1111-sd-webui-tagcomplete A browser-side extension for AUTOMATIC1111's Stable Diffusion web UI that provides Booru-style tag autocompletion while typing prompts. It … | 62 | 2807 | 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 |
| joelshepherd/tabliss Tabliss is a beautiful, customisable New Tab page browser extension for Firefox, Chrome, and Edge. It offers widgets like clocks, weather, … | 32 | 2788 | active |
| chibisafe/chibisafe Chibisafe is a self-hosted file uploader and vault service written in TypeScript that accepts any file type and returns shareable links. It… | 78 | 2775 | active |
| pionxzh/chatgpt-exporter A Tampermonkey userscript that adds export functionality to the ChatGPT web interface, letting users save and share their conversation hist… | 97 | 2762 | active |
| cars10/elasticvue Elasticvue is a free, open-source GUI for Elasticsearch available as a desktop app, browser extension, Docker container, or self-hosted web… | 98 | 2759 | 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 |
| salarcode/SmartProxy SmartProxy is a Firefox, Chrome, and Edge browser extension that automatically enables or disables proxy usage per website based on customi… | 88 | 2748 | active |
| dimdenGD/OldTwitter A browser extension that restores the old Twitter layout from 2015 (with an optional 2018 design) by fully replacing the modern Twitter cli… | 98 | 2734 | active |
| facebook/react-devtools React DevTools is a browser extension for Chrome and Firefox that lets developers inspect the React component hierarchy within the browser'… | 10 | 11008 | maintenance |
| prinsss/twitter-web-exporter A UserScript (for Tampermonkey/Violentmonkey) that exports tweets, bookmarks, lists, followers, search results, and media from the Twitter/… | 86 | 2721 | active |
| puemos/hls-downloader A browser extension that automatically detects HTTP Live Streaming (HLS) playlists on web pages and lets users download selected video and … | 89 | 2714 | active |
| chinchang/web-maker Web Maker is a free, open-source offline frontend playground for HTML, CSS, and JavaScript, similar to CodePen or JSFiddle but running enti… | 72 | 2703 | active |
| xmcp/pakku.js pakku.js is a browser extension for Chrome, Edge, and Firefox that automatically merges repeated (spam) danmaku (bullet comments) on the Ch… | 74 | 2681 | active |
| pt-plugins/PT-depiler PT-depiler is a Manifest v3 browser extension that improves efficiency when using private tracker (PT) sites, succeeding PT-Plugin-Plus. It… | 100 | 2670 | active |
| insin/control-panel-for-twitter Control Panel for Twitter is a browser extension for desktop and mobile browsers that gives users more control over their Twitter/X experie… | 95 | 2642 | active |
| EnixCoda/Gitako Gitako is a free browser extension that adds a file tree sidebar to GitHub, with instant file search and keyboard navigation. It works on C… | 96 | 2604 | active |
| srbhptl39/MCP-SuperAssistant A browser extension (Chrome and Firefox) that brings Model Context Protocol (MCP) tool support to web-based AI chat platforms like ChatGPT,… | 55 | 2592 | active |
| molvqingtai/WebChat A decentralized browser extension that lets visitors of the same website chat anonymously via WebRTC peer-to-peer, end-to-end encrypted com… | 93 | 2571 | active |
| dudor/BookmarkHub BookmarkHub is a browser extension that synchronizes bookmarks across different browsers (Chrome, Firefox, Edge, and other Chromium-based b… | 53 | 2571 | active |
| gijsdev/ublock-hide-yt-shorts A uBlock Origin filter list that hides all traces of YouTube Shorts videos. It is imported into uBlock Origin's dashboard as a custom filte… | 78 | 2507 | active |
| OneKey OneKey is an open-source, multi-chain cryptocurrency wallet application supporting Bitcoin, Ethereum, Solana, Tron, and many other networks… | 99 | 2468 | active |
| dutiyesh/chrome-extension-cli A command-line tool that scaffolds Chrome extension projects with preconfigured Webpack, supporting JavaScript and TypeScript. It generates… | 23 | 2465 | active |
| sienori/Tab-Session-Manager Tab Session Manager is a WebExtension that saves and restores the state of browser windows and tabs, with support for automatic saving. It … | 86 | 2462 | active |
| kevmo314/magic-copy Magic Copy is a browser extension (Chrome, Firefox, and Figma) that uses Meta's Segment Anything Model to segment a foreground object from … | 21 | 2454 | active |
| dimdenGD/OldTweetDeck A browser extension that restores the classic (old) TweetDeck interface on X/Twitter. It works on Chromium-based browsers and Firefox by in… | 84 | 2442 | active |
| ccloli/E-Hentai-Downloader A userscript that downloads E-Hentai/ExHentai galleries as zip files directly from the browser. It runs via userscript managers like Tamper… | 56 | 2442 | active |
| she-llac/claude-counter A minimal browser extension (and userscript) that overlays token counts, cache countdown timers, and session/weekly usage bars on claude.ai… | 51 | 2440 | active |
| iann0036/former2 Former2 scans your existing AWS account resources and generates Infrastructure-as-Code outputs such as CloudFormation, Terraform, Troposphe… | 70 | 2415 | active |