Just FYI - Firefox mobile cuts this down to one “dismiss without supporting” coverup.

I had to go check with another browser to confirm the nasty behavior you described. Which does happen.

Thanks: I should give it a go. Safari runs really well on iOS but the lack of an adblocker is a real pain. Firefox + ublock origin has been my goto on desktop since before Chrome deprecated Manifest V2 support, so I probably should at least try it on mobile.