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WebUSB Extension for Firefox

·2026.04.20 20:51

Key point

An extension that adds WebUSB functionality to Firefox via native messaging.

Details

An extension that adds WebUSB functionality to Firefox is provided together with a native stub for it.

To install it, you need to install a separate program on your PC along with the browser extension, and this program relays USB access between the browser and the system.

Supported platforms are as follows.

  • macOS: x86_64, ARM64
  • Linux: x86_64, aarch64
  • Windows: AMD64, ARM64

System requirements are also specified.

  • macOS 10.15+
  • Windows 10+
  • Linux kernel 4.8+ and /dev, /sys, udev or a compatible daemon required

The source is written in Rust and can be built with cargo build from the native-stub directory. Linux uses musl static linking by default, and Windows uses mingw-w64 / gnullvm targets.

Also, for each OS you need to set the native manifest location or registry key so that Firefox can find it, and it's noted that exceptional environments such as shared home directories or roaming profiles may have issues with the default installation method.

usbfirefoxwebusbbrowser-extension
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