WebHID von Kazoku

Firefox doesn't natively support the WebHID API. This add-on adds it back, so websites that use navigator.hid work just like they do in Chrome. Play browser-based games with your controller, configure your keyboard from a web page, or interact with any USB HID device without leaving Firefox.

Requires a companion daemon to talk to your hardware. It's a small, open-source background service (Linux, macOS, and Windows supported). Download and setup instructions: https://github.com/K4zoku/FF-WebHID

Key features

• Plug and play: once the daemon is installed and running in background, devices show up automatically in any website's device picker
• Dual transport modes: switch between WebSocket (fast, off-main-thread) and Native Messaging (simple, reliable) per site
• Multi-tab support: open the same device in multiple tabs simultaneously, each gets its own input reports
• Auto-reconnect: daemon restarted? Device unplugged and replugged? The add-on reconnects automatically with no page reload
• Hot-plug: plug in a new device while browsing and it appears instantly in the device picker
• Security first: FIDO/U2F security keys (YubiKey, Titan, etc.) are blocked by default. Devices require explicit per-site permission grants
• Cross-platform: works on Linux, macOS, and Windows

Installation

1. Install the add-on from this page
2. Install the system daemon (see the installation guide)
3. Restart Firefox
4. Visit any WebHID-enabled website and start using your devices

Privacy

• All device communication stays on 127.0.0.1 (localhost)
• No data is sent to any external server
• WebSocket connections are localhost-only and token-authenticated
• Device permissions are stored locally per site origin