Browser Extension GitHub Repositories (2026) · Open Source Tools

Read one post and leave. Chrome and Firefox extension that opens X and Bluesky post links in a popup, not the full site. No account, no cookies sent to either.

An awesome browser extension that reads aloud webpage content with one click

daily.dev is the personalized developer news feed and community. Get the best tech content from all over the web in your browser new tab or on mobile. Free and open source.

Integrating ChatGPT into your browser deeply, everything you need is here

This userscript for YouTube offers 250+ layout changes and features such as tab view, speed control, miniplayer support, export transcripts, square design, auto-theater mode, and much more—all easily customizable via settings panels.

A command line tool to help build, run, and test web extensions

KeePassXC Browser Extension

Browser-native side panel for Hermes Agent — connect web context to your local Hermes runtime.

🪄 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

Omni Browser is a secure, open-source Android browser by RebelRoot. Built on Mozilla GeckoView, it features native WebExtension support, aggressive media stream interception, a private encrypted locker, and on-device machine learning tools.

The fast, beautiful, open-source download manager for Windows, macOS and Linux — up to 32 connections, browser integration, video & MP3 downloads, crash-safe resume.

A List of Free and Open-Source Software

🔍 Extension that detects which JavaScript libraries are running on a page

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.

🏝️ A CLI Tool to Automate Your Everyday Web Browser.

Browser extension which adds comprehensive keyboard shortcuts to Todoist, beyond what is offered by Todoist itself

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

Cross-platform desktop download manager for direct files, browser handoffs, media, playlists, queues, and scheduling.