Top MANIFEST-V3 GitHub Repositories & Tools (2026)

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

The cross-browser extension framework.

SingleFile version compatible with Manifest V3

Reactive HTML attributes. No build step, signals-based, CSP-safe.

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

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.