A Firefox browser extension that adds WebUSB support by bridging the browser to a native stub program via Firefox's native messaging API. The native stub is written in Rust and supports macOS, Linux, and Windows. Installation requires both the .xpi extension and a platform-specific native stub binary, with setup instructions covering prebuilt binaries and building from source using Cargo. Linux support requires kernel 4.8+ with specific USB capabilities, while Windows targets the UCRT via mingw-w64.
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