Page refreshes constantly on Firefox on Windows

[1j01]

I was never able to get the Firefox Web MIDI browser extension to work on Ubuntu, but it works on Windows.

I have some code that's supposed to refresh the page automatically when no MIDI devices are detected, but it's refreshing too often (and while TASCAM US-122L MIDI is present), although it did stop once I turned on my MIDI keyboard and started playing.

It should probably have a time limit at least, stored across page reloads.