Updated firmware to 1.93, can't connect.

The Relay Key entry should be 5th from the top in Communications.

Strange -- I don't see it. I have: Auto Save, Baud Rate, Connect over Audio, Connect over Bluetooth Smart (Web Bluetooth), Reset Before Send, Store Line Numbers . . . but no Relay Key.

Which one doesn't work in Firefox? the phone, or the PC version?

Sorry, Firefox didn't work on Android, but Chrome did. I'm using Chromium on the PC.

When you start espruino-server after doing all that extra stuff and go to the 'connect' window, do you see noble starting scan now?

I don't see that message. On the terminal, I get this output:
Wed Aug 02 2017 16:22:58 GMT+0000 (UTC) HTTP GET /serial/ports

Interestingly enough, if I go to Communications on espruino-server, I don't see an option for Connect over Bluetooth Smart (Web Bluetooth), which I can see in the Web IDE.

You could look in /usr/lib/node_modules/espruino-web-ide/n­ode_modules/ (or whatever your npm directory was) and see if noble was in there[.]

It is indeed there. : \

Do you think any further debugging is useful at this point? It would be great to get the puck working, but I'm wondering if I might have better luck exchanging it for a pico or wifi.