- Download and install Chrome Canary.
- Star it with command "/Applications/Google\ Chrome\ Canary.app/Contents/MacOS/Google\ Chrome\ Canary --enable-blink-features=WebBluetoothScanning"
- Ignore the message "You are using an unsupported command-line flag: --enable-blink-features=WebBluetoothScanning. Stability and security will suffer."
- Open chrome://flags/
- Enable "Experimental Web Platform features"
- Paste proto.js to console.