Also from Piefed.zip, also from Gecko browser (in my case, Waterfox) and also a uBlock Origin user, but no issues on my end.

I would guess that's related to LibreWolf's aggressive privacy settings. Maybe try to add an exception for Piefed or disabling Resist Fingerprinting to check if it fixes the issue.

Try disabling the anti-fingerprinting on the site. I find librewolf fucks with a lot of stuff with that on because basically every modern feature can be used to fingerprint you.

That being said, I have not noticed librewolf fucking with my instance of piefed, but it's a good place to start to diagnose the issue

I cant remember ever having issues on normal Firefox on my Desktop.

But now that you say it i also have similar hickups with the tooltips on Ironfox on Android.

So maybe this is a hardened Firefox issue?

Unrelated but i also had once software gore:

not complaining. That was kinda cool. :>

I use regular Firefox. I haven't seen any issues. Are you using any extensions that might be interfering? Try opening the browser in debug mode and see if the issues disappear.