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 |
|---|---|---|---|
| F9y4ng/GreasyFork-Scripts A collection of open-source userscripts for desktop browsers, most notably Font Rendering (Customized) for high-quality web typography and … | 76 | 1532 | active |
| import-ai/omnibox OmniBox is a cross-platform, self-hostable AI knowledge hub that lets users collect webpages, files, and voice notes, then parse, index, an… | 89 | 1527 | active |
| kkapsner/CanvasBlocker A Firefox browser extension that protects users from browser fingerprinting by blocking or faking readouts of JavaScript APIs such as canva… | 73 | 1525 | active |
| gitcoffee-os/postbot PostBot is an open-source multi-platform content synchronization assistant that publishes articles, notes, images, videos, and audio to man… | 62 | 1524 | active |
| overspace-labs/CaA CaA is a BurpSuite extension (Montoya API) that analyzes HTTP traffic to extract parameters, paths, files, and parameter values with freque… | 77 | 1521 | active |
| ray-lothian/UserAgent-Switcher A highly configurable browser extension that spoofs the User-Agent string across Chrome, Firefox, Edge, and Opera. It overrides HTTP reques… | 75 | 1517 | active |
| andrewnguonly/Lumos Lumos is a Chrome extension that acts as a RAG-powered LLM co-pilot for browsing the web, letting users summarize pages and ask questions a… | 18 | 1511 | active |
| memfreeme/memfree MemFree is an open-source hybrid AI search engine that answers questions using both your personal knowledge base and the web, integrating m… | 62 | 1507 | active |
| manojVivek/medium-unlimited A browser extension for Chrome and Firefox that unlocks Medium.com membership-only articles by bypassing the paywall. It supports medium.co… | 10 | 5462 | maintenance |
| duckduckgo/duckduckgo-privacy-extension DuckDuckGo Privacy Essentials is a browser extension for Firefox, Chrome, Edge, and Opera that blocks third-party trackers and ads, manages… | 99 | 1501 | active |
| apinanaivot/IKEA-3D-Model-Download-Button A Tampermonkey userscript that adds a 'Download 3D' button to IKEA product pages, letting users save the product's 3D model as a .GLB file.… | 50 | 1501 | active |
| dteviot/WebToEpub A Chrome and Firefox browser extension that converts web novels and other web pages into EPUB ebooks for offline reading. It supports many … | 92 | 1490 | active |
| kepano/clipper-templates A collection of templates for the Obsidian Web Clipper browser extension, covering generic schemas (recipes, products) and specific sites l… | 52 | 1484 | active |
| AgentQL AgentQL is a suite of tools for extracting structured data and automating workflows on live websites using an AI-powered natural language q… | 70 | 1472 | active |
| momosecurity/FindSomething FindSomething is a passive browser extension for Chrome and Firefox that extracts potentially sensitive information (like emails, API keys,… | 32 | 1470 | active |
| sienori/simple-translate Simple Translate is a browser extension (WebExtension) that lets users quickly translate selected text on web pages or typed text via a too… | 82 | 1464 | active |
| thomaschampagne/elevate Elevate is a sport analytics app available as a desktop application (Electron) and a browser web extension that enhances Strava. It tracks … | 37 | 1464 | active |
| kjtsune/embyToLocalPlayer A Python tool with a companion browser userscript that lets Emby/Jellyfin (and Plex) web UIs launch external local video players like mpv, … | 86 | 1456 | active |
| webbrain-one/webbrain WebBrain is an open-source AI browser agent extension for Chrome, Firefox, and Edge that puts an LLM-powered assistant in a side panel. It … | 78 | 1456 | active |
| PreMiD PreMiD is a utility that displays your web browsing, video, music, and browser game activity in your Discord profile via Discord Rich Prese… | 59 | 1453 | active |
| k1995/github-i18n-plugin A Tampermonkey userscript that translates the GitHub.com interface into Chinese (and Japanese), localizing menus, titles, buttons, and othe… | 68 | 1445 | active |
| omegaee/my-fingerprint A lightweight browser extension built on Manifest V3 that protects against browser fingerprinting across Chrome, Edge, and Firefox. It spoo… | 89 | 1441 | active |
| tilfinltd/aws-extend-switch-roles A browser extension for Chrome, Firefox, and Edge that extends the AWS Management Console's built-in IAM role switching. It lets users conf… | 89 | 1429 | active |
| jez500/pricebuddy PriceBuddy is a self-hostable web application that tracks product prices and availability across online stores, keeping price history and n… | 88 | 1416 | active |
| danny0838/content-farm-terminator Content Farm Terminator is a cross-platform browser extension that identifies content farms by marking hyperlinks pointing to them and bloc… | 76 | 1415 | active |
| greatsuspender/thegreatsuspender The Great Suspender is a free, open-source Google Chrome extension that automatically suspends inactive tabs to free up memory and CPU. It … | 23 | 5075 | maintenance |
| amitbl/blocktube BlockTube is a WebExtension for Chrome and Firefox that filters and blocks unwanted YouTube content such as videos, channels, and comments … | 59 | 1408 | active |
| gioxx/MarvellousSuspender The Marvellous Suspender is a free, open-source Chrome extension that automatically suspends inactive tabs to free memory and CPU, based on… | 98 | 1403 | active |
| Drive4ik/simple-tab-groups A Firefox WebExtension for creating, modifying, and quickly switching between tab groups, with support for multiple browser windows, contai… | 77 | 1399 | active |
| WindRunnerMax/TKScript A collection of GreaseMonkey/TamperMonkey userscripts and browser extensions written in TypeScript, including tools like Force Copy, link r… | 60 | 1386 | active |
| iszhouhua/social-media-copilot An open-source browser extension (built with WXT and TypeScript) that scrapes data from Chinese social media platforms including Xiaohongsh… | 64 | 1373 | active |
| dethcrypto/dethcode DethCode lets you view the verified source of deployed Ethereum smart contracts in an ephemeral VS Code instance by changing an Etherscan U… | 48 | 1368 | active |
| AdguardTeam/AdGuardExtra AdGuard Extra is a userscript and browser extension that combats ad-blocking circumvention on sites where regular filter rules fail. It wor… | 33 | 1350 | active |
| yeswehack/PwnFox PwnFox is a Firefox extension paired with a Burp Suite extension that provides tools for web security audits, such as one-click Burp proxy … | 23 | 1350 | active |
| yourduskquibbles/webannoyances Web Annoyances Ultralist is a filter list for uBlock Origin and AdGuard that removes annoying web elements like sticky headers, floating vi… | 32 | 1348 | active |
| helloyanis/age-verification-bypass A Firefox WebExtension that skips age verification screens on sites like AgeChecker.net, AgeVerif, Bluesky, Reddit, and AliExpress. It is a… | 80 | 1346 | active |
| lucahammer/tweetXer A JavaScript userscript that bulk-deletes all your tweets on X (Twitter) for free, using your official Data Export file. It runs in the bro… | 52 | 1342 | active |
| useful-forks/useful-forks.github.io Useful Forks is a web tool and Chrome extension that improves GitHub fork discoverability by automatically filtering out forks with no comm… | 66 | 1339 | active |
| fossasia/scrum_helper Scrum Helper is a browser extension that automatically generates scrum/development reports from a user's GitHub activity (commits, pull req… | 99 | 1335 | active |
| ttop32/MouseTooltipTranslator A browser extension (Chrome, Edge, Firefox) that translates any text you hover over or select, showing an inline tooltip. It also supports … | 90 | 1332 | active |
| jmerle/competitive-companion A browser extension that parses competitive programming problems from online judges like Codeforces, AtCoder, and Kattis. It extracts test … | 90 | 1332 | active |
| bpking1/embyExternalUrl A collection of nginx njs scripts and userscripts that add external player links to Emby, Jellyfin, and Plex media servers, and redirect pl… | 47 | 1330 | active |
| denho/faved Faved is a free, open-source, self-hostable bookmark manager with customizable nested tags, instant search, and duplicate detection, built … | 78 | 1324 | active |
| lindylearn/unclutter Unclutter is a browser extension for Chrome and Firefox that provides a modern reader mode by modifying a page's CSS to remove ads and clut… | 23 | 1322 | active |
| gorhill/uMatrix uMatrix is a browser extension that lets users point-and-click filter network requests by source, destination, and type, acting as a firewa… | 10 | 4679 | maintenance |
| FirefoxBar/HeaderEditor Header Editor is a browser extension (WebExtension) for Firefox, Chrome, and Edge that lets users modify HTTP requests and responses via ru… | 99 | 1311 | active |
| ZachSaucier/Just-Read Just Read is a customizable reader mode browser extension that reformats article pages into a clean, distraction-free reading view with cus… | 76 | 1311 | active |
| Stay Stay is an open-source local userscript manager implemented as a Safari extension for iOS and iPadOS, compatible with Tampermonkey/Greasemo… | 23 | 1311 | active |
| AI-Prompt-Genius/AI-Prompt-Genius AI Prompt Genius is a Chrome browser extension for curating a personal library of AI prompts with tagging, folders, import/export, and cros… | 66 | 1305 | active |
| harshjv/github-repo-size A Chrome extension that displays a GitHub repository's size directly in the repository summary. It uses the GitHub API and supports private… | 10 | 1302 | active |
| night/betterttv BetterTTV is a browser extension that enhances Twitch (and YouTube) with extra features, custom emotes, and chat improvements. It is built … | 98 | 1295 | active |
| kzahel/web-server-chrome 200 OK Web Server is a cross-platform static file server app rebuilt by the original author of Web Server for Chrome, available as a deskto… | 96 | 1293 | active |
| passff/passff PassFF is a Mozilla Firefox extension that provides browser access to a zx2c4 pass password store. It can list, fill, and submit login form… | 64 | 1290 | active |
| honestbleeps/Reddit-Enhancement-Suite Reddit Enhancement Suite (RES) is a community-driven, GPLv3-licensed browser extension that adds many quality-of-life modules to Reddit, su… | 92 | 4525 | maintenance |
| acgotaku/YAAW-for-Chrome A Chrome extension providing a web frontend dashboard for the Aria2 download manager via its JSON-RPC interface. It can intercept browser d… | 68 | 1273 | active |
| huhu/rust-search-extension A browser extension for Chrome, Firefox, and Edge that provides instant search of Rust documentation, crates, builtin attributes, books, an… | 86 | 1271 | active |
| hymbz/ComicReadScript A userscript (Tampermonkey/Violentmonkey) that adds a two-page spread reading mode and various UX enhancements to popular manga/comic websi… | 93 | 1270 | active |
| zhang-wangz/LeetCodeRating LeetCodeRating is a Tampermonkey userscript (browser plugin) that overlays weekly-contest difficulty scores onto LeetCode problem pages, pr… | 82 | 1269 | active |
| whale4113/cloud-document-converter Cloud Document Converter is a browser extension that lets users download or copy Lark (Feishu) documents as Markdown directly from the Lark… | 80 | 1267 | active |
| better-auth/better-hub Better Hub is a re-imagined code collaboration platform that provides an improved interface for GitHub, covering repo overviews, PR reviews… | 50 | 1267 | active |
| gooreplacer Gooreplacer is a browser extension for Chrome, Firefox, and Edge that redirects or blocks URLs and modifies HTTP request/response headers b… | 10 | 1265 | active |
| YouG-o/YouTube-No-Translation A browser extension that prevents YouTube from automatically translating video titles, descriptions, thumbnails, subtitles, and audio track… | 82 | 1263 | active |
| kairi003/Get-cookies.txt-LOCALLY A browser extension for Chrome and Firefox that exports cookies in Netscape cookies.txt or JSON format entirely locally, without transmitti… | 42 | 1260 | active |
| AIPexStudio/AIPex AIPex is an open-source (MIT) AI browser automation assistant delivered as a Chrome/Edge extension that runs inside your existing browser w… | 76 | 1256 | active |
| crittermike/shortkeys Shortkeys is a cross-browser extension (Chrome, Firefox, Edge, Opera) for creating custom keyboard shortcuts with 125+ built-in actions lik… | 89 | 1255 | active |
| Nolovenodie/emby-crx An enhancement and beautification plugin for Emby media servers, available as a Chrome-based browser extension or as a server-side deployme… | 40 | 1255 | active |
| tomorrow505/auto_feed_js A Tampermonkey/Greasemonkey userscript that enables one-click cross-posting (re-seeding) of torrents across 100+ private tracker sites. It … | 75 | 1252 | active |
| franklioxygen/MyTube MyTube is a self-hosted web application that downloads videos from YouTube, Bilibili, Twitch, MissAV, and any yt-dlp-supported site, storin… | 65 | 1251 | active |
| WebScrapBook WebScrapBook is a browser extension that captures web pages faithfully into various archive formats (including MAFF and HTZ) for local or b… | 76 | 1243 | active |
| Aria2 Explorer Aria2 Explorer is a Chromium browser extension that exports and auto-captures browser download tasks to the Aria2 download utility via its … | 94 | 1242 | active |
| pnd280/complexity Complexity is a browser extension suite that enhances AI chat web apps, currently targeting Perplexity AI on Chrome, Firefox, Firefox Andro… | 70 | 1241 | active |
| SteamDB SteamDB's official browser extension for Chrome, Firefox, and Edge that enhances Steam store and community websites. It adds SteamDB links … | 73 | 1240 | active |
| webext-redux webext-redux is a JavaScript library providing utilities for building Redux-powered web browser extensions. It lets the background page hol… | 23 | 1236 | active |
| Demystify (formerly OpenAPI DevTools) A browser extension for Chrome and Firefox that automatically generates OpenAPI 3.1 specifications in real time from network requests obser… | 20 | 4304 | maintenance |
| mika-cn/maoxian-web-clipper MaoXian Web Clipper is a browser extension for Firefox and Chrome that clips selected content from web pages and saves it to the local mach… | 64 | 1224 | active |
| New Moon Theme New Moon is an optimized dark syntax highlighting theme designed for web development, with a consistent color palette across editors, termi… | 23 | 1224 | stable |
| zgrossbart/jdd JSON Diff is a web-based semantic comparison tool that validates, formats, and compares two JSON documents to show actual data differences … | 32 | 1219 | stable |
| andywang425/BLTH Bilibili Live Tasks Helper (BLTH) is a Tampermonkey/Violentmonkey userscript that automates daily tasks on Bilibili live streams, such as w… | 96 | 1218 | active |
| Sak32009/GetDataFromSteam-SteamDB A userscript that extracts game and DLC data from Steam store pages and SteamDB. It runs via userscript managers like Tampermonkey or Viole… | 74 | 1214 | active |
| rNeomy/auto-tab-discard Auto Tab Discard is a browser extension that uses the native tab discarding API (chrome.tabs.discard) to automatically discard inactive tab… | 65 | 1212 | active |
| coolpace/V2EX_Polish V2EX Polish is a lightweight browser extension (also available as a userscript) that enhances the V2EX forum with a modernized UI, nested c… | 53 | 1210 | active |
| EltonChou/TwitterMediaHarvest Media Harvest is a browser extension that downloads images and videos from X (Twitter) with one click, directly in the browser without sign… | 93 | 1200 | active |
| law-chain-hot/websocket-devtools A Chrome/Edge DevTools browser extension for monitoring, simulating, and blocking WebSocket traffic. It integrates as a native DevTools pan… | 84 | 1198 | active |
| AdguardTeam/AdGuardMiniForMac AdGuard Mini for Mac is a free, open-source Safari extension that blocks ads, trackers, and annoyances like cookie notices and popups in th… | 91 | 1186 | active |
| callumlocke/json-formatter A Chrome browser extension that formats and pretty-prints JSON API responses with syntax highlighting, collapsible trees, dark mode, and co… | 76 | 4134 | maintenance |
| hoothin/SearchJumper SearchJumper is an open-source browser extension (also available as a userscript) for quickly switching between search engines and searchin… | 76 | 1178 | active |
| jenish-sojitra/JSAnalyzer A Burp Suite extension written in Python (Jython) that performs static analysis on JavaScript files proxied through Burp. It extracts API e… | 41 | 1175 | active |
| ShotEasy ShotEasy is a free online photo and screenshot toolkit built with Astro that runs entirely in the browser using WebAssembly. It offers scre… | 70 | 1168 | active |
| caigg188/LDStatusPro LDStatus Pro is a Tampermonkey userscript (with an accompanying website and storefront frontend) that enhances the Linux.do and IDCFlare Di… | 83 | 1164 | active |
| asdfghj1237890/WebVideo2NAS A self-hosted pipeline consisting of a Chrome extension and a Dockerized FastAPI backend that detects HLS (M3U8), DASH (MPD), MP4, and MOV … | 82 | 1164 | active |
| hackademix/noscript NoScript Security Suite is a free open-source browser extension that lets users decide which websites are trusted to run JavaScript and oth… | 98 | 1162 | active |
| ccd0/4chan-x 4chan X is a userscript that adds features like thread watching, quote linking, and inline image expansion to anonymous imageboards such as… | 73 | 1158 | active |
| steveseguin/social_stream Social Stream Ninja is a free, open-source tool that consolidates live chat messages from 120+ social platforms (YouTube, Twitch, TikTok, F… | 97 | 1156 | active |
| nico-martin/gemma4-browser-extension A Chrome extension that runs an on-device AI agent powered by Transformers.js and Gemma 4 via WebGPU, entirely locally with no data sent to… | 57 | 1155 | active |
| toggl/track-extension The official Toggl Track browser extension (formerly Toggl Button) for Chrome and Firefox that lets users start and stop time-tracking time… | 95 | 1150 | active |
| GENEXIS-AI/chromex Chromex is a Chrome MV3 side-panel extension that connects the browser to OpenAI's Codex CLI via a local native-messaging bridge. It lets u… | 66 | 1150 | active |
| DevLARLEY/WidevineProxy2 A browser extension (Chrome and Firefox, Manifest V3) that proxies Widevine and ClearKey EME challenges and license messages, modifying cha… | 85 | 1143 | active |
| osnr/TabFS TabFS is a browser extension that mounts your open browser tabs as a filesystem on your computer, mapping each tab to a folder whose files … | 32 | 3937 | maintenance |
| NativeMindBrowser/NativeMindExtension NativeMind is an open-source browser extension that provides a fully private, on-device AI assistant by connecting to local LLMs via Ollama… | 60 | 1133 | active |
| alexadam/save-as-ebook A Chrome/Firefox/Opera Web Extension that saves a web page or a text selection as an eBook in .epub format. It supports collecting multiple… | 94 | 1126 | active |