WebUSB Extension for Firefox: Installation and Configuration

The WebUSB extension for Firefox enhances the browser by enabling WebUSB functionality through native messaging. To utilize this feature, users must install both the browser extension and a separate program on their computer, known as the 'native stub'. The extension can be installed by downloading binaries from GitHub or building from source. For the native stub, prebuilt binaries are available for macOS, Linux, and Windows, with specific installation scripts provided for each platform.

## Installation Process

To install the extension, download the .xpi file for a signed version or load a testing version via Firefox Developer Edition. The native stub installation involves unzipping files and running platform-specific scripts to configure the native manifest, which allows the browser to locate the stub.

## System Requirements and Compatibility

The extension supports modern desktop platforms, with specific requirements for macOS, Windows, and Linux. For macOS, version 10.15 or later is needed, while Windows requires version 10 or later. Linux users need a kernel version 4.8 or newer, with specific USB and daemon requirements.

## Building from Source

The native stub is written in Rust, and users can compile it using 'cargo build'. Cross-compiling is supported for different platforms, with specific instructions for macOS, Linux, and Windows. Setting up a native manifest involves placing a JSON file in a designated location, with different paths for each operating system.

## Developer Guidance

Developers can refer to the architecture documentation for further insights into the extension's structure and functionality.