Apologies, Flinx. The autocorrection mangled your name. I don’t think people can access your link. I tried and I can’t, but I will submit another feedback through Windows Defender.
It looks like there are at least two different ways to clear cache in FF. The first one is under History as RobW pointed out, the other one is under Cookies and Site Data. One needs to click on Clear Data button and will be presented with two choices...
TomH submitted this bug to Mozilla team a few days ago. Here is the link. They seem to be looking at it1872395 - HTML/Phish!pz threat appears in Firefox cache after update to 121.0
