hey, thanks for the contribution! A screenshot for a UI change is always welcomed.

Of course. I'm not proud of the UI I did so perhaps someone else can improove that part. However I believe the functionality is as requested.

Minor improvement using opacity change for visual confirmation instead of crosshair cursor

Just a slight informational message, this is how it looks with the LiChess Tools extension:

While I can't call myself any kind of UI designer, I believe a small white x next to the name might be a lot easier to mistakenly click. May I suggest you make it more visible (different color) and perhaps change its position so it's not in line with the text?

I think I like your design better than mine, but I feel it's a bit more dangerous, if that makes sense.

There’s a PR with a more refined design here #13518

merged #13518 instead