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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@Gordon
Yes, this is a known issue. Mozilla refuse to implement Web Bluetooth in their browser.
But to be fair I beleive pretty much all the docs say to use Chrome (or Chromium should work - but some folks have reported issues with that)