Top BROWSER-EXTENSION GitHub Repositories & Tools (2026)

Sync your browser to storage you own. No middleman, no account, no tracking

The cross-browser extension framework.

Privacy-first password manager with built-in email aliasing. Fully encrypted and self-hostable.

The cross-harness self-improving memory layer for AI agents.

🏝️ A CLI Tool to Automate Your Everyday Web Browser.

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.

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.

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

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.

AI side-question layer — ask aside, stay on track.