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  3. Bug?

Don't understand how you can make a move and then lose on time (the move didn't register for some reason?)

You probably had Internet connection problems and so your moves couldn't reach the server meaning your moves didn't register.
lichess.org/lag

I have experienced a similar thing today in three games already.
I am unable to make a move, the piece is short of stuck to my mouse cursor. I noticed that I can get rid of that by making a right click somewhere on the page.

I have Firefox 56.0 (64-bit) on Fedora 26 (Linux).

I should note that this happened mid-game multiple times in a row in multiple games.

This bug also seems to block me from using my Gnome3's features by letting the browser window block other mouse activities.

I'm curious whether this also affects Waterfox (I'd expect it would unless the bloatware of Firefox is at fault).

Well I can report that I just had the same thing happen with Chrome too:
Version 62.0.3202.75 (Official Build) (64-bit) on Fedora 26 gnome3

Would really like to hear if anyone else is experiencing this.
Basically what happens is:
I try to make a move, I press mouse1 down and move piece, release mouse1 but the move doesn't happen. Instead the piece is kind of stuck selected as if I was still holding mouse1. I have only been able to escape that so far by pressing mouse2 somewhere on the page.