[chrismorgan]

I’m observing this extra outline on Firefox Nightly on Windows. I can’t discern what’s making it, and suspect it may be a Firefox bug, somehow.

[Izkata]

It's literally a feature, not a bug:

https://developer.mozilla.org/en-US/docs/Web/CSS/::-moz-focu...

https://stackoverflow.com/questions/71074/how-to-remove-fire...

[chrismorgan]

Ah yes, I had completely forgotten about ::-moz-focus-inner.