Firefox Extension GitHub Repositories (2026) · Open Source Tools

Ghostery Browser Extension for Firefox, Chrome, Opera, Edge and Safari

🪄 A browser extension that captures your workflow as you click and turns it into a step-by-step guide with annotated screenshots 📸

Use native tab discarding method to automatically reduce memory usage of inactive tabs

A Firefox "clone" of It's All Text for spawning an editor to edit text areas in browsers. Based on David Hilley's original Chromium extension.

Fully portable and lightweight ZIM reader written entirely in Javascript. Runs both as a Browser Extension and as a Progressive Web App.

Browser extension that removes the premium blur, banners and ads on Studocu and Studeersnel, and downloads documents as PDF

The first AI agent harness native to the browser. A browser extension that runs a full agent loop where you already work: it drives your tabs, spins up sandboxed compute (JS notebooks, WASM Linux VMs, client-side apps), and shares what it builds peer-to-peer. BYOK, no backend, no telemetry.

Google Chrome, Firefox, Opera and Microsoft Edge extension for reading news from RSS aggregator Feedly

Browser extension and iOS app that spoofs your gps, geolocation & timezone, and auto-syncs to your VPN. Firefox, Chrome, Edge, Brave & Safari.

Browser plugin for Linux to SSO on Microsoft Entra ID using a locally running microsoft identity broker (Intune).

Send downloads, links, and torrent files directly to your Aria2 server or Motrix instance.

Firefox/Chrome Extension to provide bullet chatting (Danmaku) on YouTube Live, like niconico or bilibili.

LockedIn is a Browser extension that hides all distractions: Shorts, homepage feed, recommendations, explore, and more. It features a miniml Popup UI with simple toggles to create your perfect, distraction-free viewing environment.

FireX Proxy is a browser extension built to unblock websites and provide private browsing. Since 2011.

Filter & Control Anything on YouTube or YouTube Kids

Private AI summarizer for anything you read. Inspired by Mozilla's Orbit.

Browser extension for sound responses

Debloated fork of the extension "I don't care about cookies"