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 |
|---|---|---|---|
| GoogleChromeLabs/ProjectVisBug VisBug is an open-source browser extension that brings design-tool interactions to any live webpage, letting designers point, click, multi-… | 10 | 5766 | active |
| zxlie/FeHelper FeHelper is an all-in-one browser extension toolbox for Chrome, Firefox, and Edge (Manifest V3) that bundles 30+ developer utilities such a… | 77 | 5680 | 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 |
| StackBlitz Online IDE WebContainers is a browser-based Node.js runtime from StackBlitz that lets web apps run full-stack JavaScript dev environments entirely in … | 36 | 4646 | 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 |
| 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 |
| 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 |
| 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 |
| abrahamjuliot/creepjs CreepJS is a web application that performs advanced device and browser fingerprinting to expose weaknesses in anti-fingerprinting browsers … | 67 | 2520 | active |
| glidea/banana-prompt-quicker A Chrome extension that lets users quickly insert curated and custom prompts into Google AI Studio, Gemini, and any website input box via r… | 58 | 2414 | active |
| gautamkrishnar/nothing-private Nothing Private is a proof-of-concept website demonstrating that browser fingerprinting can identify and track users even in private browsi… | 66 | 2292 | active |
| lisonge/vite-plugin-monkey A Vite plugin that lets you develop and build userscripts (.user.js) for engines like Tampermonkey, Violentmonkey, Greasemonkey, and Script… | 94 | 2058 | active |
| daymade/Twitter-Block-Porn A Tampermonkey/Greasemonkey userscript that batch-blocks Twitter/X accounts from shared blocklists of porn-spam scammers. It simulates Twit… | 74 | 2029 | active |
| ShunCai/QZoneExport A browser extension (Chrome/Edge/Firefox, Manifest V3) that backs up QQ Zone data—posts, blogs, private diaries, albums, videos, comments, … | 84 | 1863 | active |
| mailvelope/mailvelope Mailvelope is a browser extension for Chrome and Firefox that adds OpenPGP end-to-end email encryption to arbitrary webmail providers. It u… | 85 | 1847 | active |
| DimensionDev/Maskbook Mask Network is a browser extension that bridges Web2 social media platforms (X, Facebook, Instagram, Minds, Mirror) with Web3 services. It… | 97 | 1586 | active |
| Chrome DevTools Protocol The official repository for the Chrome DevTools Protocol (CDP), providing protocol definitions, documentation, and TypeScript type definiti… | 76 | 1569 | active |
| firefox-devtools/profiler Firefox Profiler is a web application for visualizing performance profiles recorded from Firefox and other browsers via the Gecko Profiler.… | 99 | 1538 | active |
| shuanx/BurpAPIFinder BurpAPIFinder is a Burp Suite extension written in Java that passively analyzes HTTP traffic (HTML and JS files) to discover hidden API end… | 16 | 1469 | active |
| samyk/evercookie Evercookie is a JavaScript API that creates extremely persistent, respawning 'super' cookies by storing identifiers across a dozen-plus bro… | 36 | 4720 | maintenance |
| 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 |
| Clean Flash A repository of clean, spyware-free builds of Adobe Flash Player, stripped of the bundled adware and telemetry found in the Chinese Flash v… | 73 | 1222 | active |
| 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 |
| brownhci/WebGazer WebGazer.js is a JavaScript eye tracking library that uses a standard webcam to predict a user's gaze location on a web page in real time. … | 59 | 3903 | maintenance |
| zeman/perfmap PerfMap is a bookmarklet and Chrome extension that overlays a performance heatmap on a webpage, visualizing when images finished loading du… | 32 | 3761 | maintenance |
| eHunter eHunter is a Tampermonkey/userscript that injects a Vue 3-based comic reader UI into supported comic sites (EH/EXHentai, NHentai), offering… | 70 | 1049 | active |
| Ghr07h/Heimdallr Heimdallr is a fully passive Chrome extension for security professionals that identifies high-risk vulnerability framework fingerprints in … | 23 | 1684 | maintenance |
| all-in-aigc/gpts-works GPTs Works is a third-party GPTs store consisting of a website for browsing and discovering custom ChatGPT GPTs, a vector-based index syste… | 20 | 1629 | maintenance |
| Song-Li/cross_browser A research project from Johns Hopkins implementing cross-browser fingerprinting that identifies users across different browsers on the same… | 32 | 1268 | maintenance |
| xyzeva/k-id-age-verifier A TypeScript tool that automatically completes K-ID age verification as an adult on platforms like Discord, Twitch, Kick, and Quora. It aut… | 59 | 1769 | experimental |
| anc95/writely Writely is an open-source browser extension for Chrome, Firefox, and Edge that brings GPT-powered AI writing assistance to any editable web… | 33 | 1296 | experimental |
| beakerbrowser/beaker Beaker Browser was an experimental peer-to-peer web browser built on Electron that added APIs for hosting 'hostless' applications using the… | 10 | 6738 | abandoned |
| transcranial/keras-js A JavaScript library for running trained Keras deep learning models directly in the browser, with GPU acceleration via WebGL 2. It also sup… | 23 | 4964 | abandoned |
| janhuenermann/neurojs neurojs is a JavaScript deep learning framework for the browser with a focus on reinforcement learning, supporting deep Q-networks and acto… | 32 | 4367 | abandoned |
| samuelmaddock/metastream Metastream is a web application and browser extension for watching streaming media (e.g., YouTube, Netflix) in sync with friends, with real… | 60 | 2648 | abandoned |
| oyvindkinsey/easyXDM easyXDM is a JavaScript library enabling cross-domain messaging and RPC between windows, working around the Same Origin Policy via postMess… | 10 | 2354 | abandoned |
| superSearchPlus superSearchPlus is a Chrome browser extension that aggregates information gathering for white-hat hackers, integrating common asset mapping… | 32 | 1434 | abandoned |
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