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 |
|---|---|---|---|
| simov/markdown-viewer A browser extension that renders Markdown files (local and remote) directly in Chrome, Firefox, Edge, and other Chromium-based browsers. It… | 46 | 1695 | active |
| ankit/stylebot Stylebot is an open-source browser extension for Chrome, Firefox, and Edge that lets users instantly change the appearance of any webpage b… | 99 | 1684 | active |
| reek/anti-adblock-killer Anti-Adblock Killer is a userscript (AakScript) plus an AdBlock-style filter list (AakList) that together prevent websites from detecting a… | 23 | 6214 | maintenance |
| goldvideo H.265 Web Player A complete web-based H.265 (HEVC) video player solution built in JavaScript. It uses JS-based stream demuxing, WebAssembly (FFmpeg) video d… | 64 | 1660 | active |
| coral-xyz/backpack Backpack is an open-source crypto wallet browser extension built in TypeScript, serving as a home for xNFTs and supporting Solana, Ethereum… | 23 | 1660 | active |
| elementdavv/internet_archive_downloader A Chrome and Firefox browser extension that downloads borrowable books from Internet Archive (archive.org) and full-view books from HathiTr… | 70 | 1651 | active |
| homerchen19/github-file-icons A browser extension that replaces the default file icons on GitHub, GitLab, Gitea, and Gogs with distinct icons per file type. It supports … | 23 | 1646 | active |
| qsniyg/maxurl Image Max URL is a userscript and browser extension that finds larger or original versions of images and videos by rewriting URL patterns, … | 75 | 1630 | active |
| kkHAIKE/fake115 A Tampermonkey userscript that disguises the browser as the official 115 client to bypass login and download restrictions on the 115 cloud … | 64 | 1625 | active |
| Online Dictionary Helper Online Dictionary Helper is a Chrome/Firefox browser extension that shows definitions of selected words and phrases from online or built-in… | 76 | 1617 | active |
| actionbook/actionbook Actionbook is an AI agent that lives in a Chrome side panel and operates websites on your behalf, reading data behind logins and paywalls a… | 71 | 1607 | active |
| dessant/web-archives Web Archives is an open-source browser extension for finding archived and cached versions of web pages across multiple search engines like … | 81 | 1602 | active |
| Ademking/MD-This-Page A browser extension for Chrome and Firefox that converts any webpage into clean, readable Markdown with one click, using Mozilla's Readabil… | 73 | 1598 | active |
| Xatta-Trone/medium-parser-extension A browser extension for Chrome, Edge, and Firefox that lets users read member-only articles on medium.com and Medium-based sites (e.g. Towa… | 56 | 1590 | active |
| SwingTheVine/Wplace-BlueMarble Blue Marble is a Tampermonkey userscript that overlays template images onto the wplace.live pixel-art canvas, showing users exactly where t… | 70 | 1571 | active |
| 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 |
| 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 |
| 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 |
| 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 |
| CosmoCreeper/Sine Sine is a community-driven mod and theme manager for Firefox-based browsers such as Floorp, LibreWolf, Waterfox, and Zen. It injects itself… | 79 | 1490 | 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 |
| 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 |
| JustAdumbPrsn/Zen-Nebula Nebula is a minimalist glassmorphism theme (userChrome CSS mod) for the Zen Browser, adding glass-like blur, animations, and UI refinements… | 57 | 1420 | active |
| tommoor/tinycon Tinycon is a small JavaScript library for dynamically manipulating the browser tab favicon, primarily to add alert bubbles with unread coun… | 32 | 5110 | maintenance |
| browserwing/browserwing BrowserWing is an open-source browser automation platform written in Go with a React dashboard that exposes browser control via MCP command… | 65 | 1419 | active |
| rhashimoto/wa-sqlite wa-sqlite is a WebAssembly build of SQLite with JavaScript-extensible virtual filesystem (VFS) support. It enables running SQLite in the br… | 91 | 1417 | 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 |
| JiGuroLGC/BetterVia BetterVia is an Xposed module (for LSPosed/LSPatch) that enhances the Via browser on Android by removing built-in whitelist restrictions on… | 81 | 1381 | active |
| xiaoxiaoflood/firefox-scripts A collection of userChromeJS scripts and legacy-style Firefox extensions loaded via autoconfig.js, enabling deep customization of Firefox a… | 32 | 1354 | 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 |
| 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 |
| 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 |
| 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 |
| tenox7/wrp WRP (Web Rendering Proxy) is a Go-based proxy server that lets vintage and legacy web browsers access the modern web. It renders pages usin… | 85 | 1294 | 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 |
| 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 |
| 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 |
| ivnvxd/arc-export A small Python CLI script that converts Arc Browser's pinned tabs into a standard HTML bookmarks file. The generated file can be imported i… | 28 | 1262 | stable |
| 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 |
| chromium/permission.site A simple website for testing how web APIs interact with browser permission prompts, covering features like geolocation, camera, Bluetooth, … | 75 | 1254 | 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 |
| privacytests/privacytests PrivacyTests is an open-source testing program that runs automated privacy audits against popular web browsers, measuring leaks like state … | 75 | 1226 | active |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| jcubic/sysend Sysend.js is a small dependency-free JavaScript library that enables message passing and synchronization between web pages open in the same… | 52 | 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 |
| LazarSoft/jsqrcode A JavaScript port of the ZXing QR code scanner that decodes QR codes from images or canvas in HTML5-enabled browsers. It supports webcam-ba… | 32 | 4012 | maintenance |
| 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 |
| JingMatrix/ChromeXt An Xposed module that adds UserScript and DevTools support to Chromium-based and WebView-based Android browsers. It hooks into browser inte… | 89 | 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 |
| jquery/jquery-mousewheel A jQuery plugin that adds cross-browser mouse wheel event support with delta normalization. It exposes normalized deltaX/deltaY values and … | 79 | 3909 | maintenance |
| 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 |
| DownThemAll! DownThemAll! is a WebExtension download manager for Firefox, Chrome, and Edge, rebuilt from scratch as a complete re-development of the cla… | 57 | 1118 | active |
| bilibili-helper/bilibili-helper-o Bilibili Helper is a Chrome browser extension that enhances bilibili.com by replacing the video player, bypassing playback restrictions, se… | 23 | 3855 | maintenance |
| yeahhe365/Gemini-Nexus Gemini Nexus is a Chrome extension (Manifest V3) that adds an AI assistant layer to the browser, integrating Gemini Web, the Gemini API, an… | 79 | 1112 | active |
| iamdustan/smoothscroll A JavaScript polyfill implementing the CSSOM Scroll Behavior specification, adding smooth scrolling support for window.scroll, window.scrol… | 32 | 3820 | maintenance |
| wtetsu/mouse-dictionary Mouse Dictionary is a super fast browser extension that shows dictionary definitions instantly when you select or hover over words on web p… | 88 | 1100 | active |
| Godiesc/firefox-gx A Firefox userChrome CSS theme that replicates the Opera GX browser skin. It is installed by copying a chrome folder and user.js into the F… | 99 | 1096 | active |
| josh-berry/tab-stash Tab Stash is a Firefox extension that saves and organizes batches of open tabs as bookmarks, letting users clear their tab bar and restore … | 77 | 1095 | active |