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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
As @fanoush says - try running
sudo hcitool scanon the console. If that doesn't display any devices then it's a problem with the OS rather than the browser.... but I'd maybe try using Chrome/Chromium (with the Experimental Features flag set) as I'm not 100% sure Opera is supporting Web Bluetooth properly? There's a forum post here that seems a bit concerning: https://forums.opera.com/topic/37464/web-bluetooth/6
Trying
chrome://bluetooth-internalscould be interesting too