Ccleaner gives message of "Firefox needs to be closed. i though it was Ccleaner that was the problem. it's not Ccleaner's problem... I get the same message when I run advanced system care... when I click 'close for me' it just skips it over and over. i then run it after starting PC and it still tells me FF is running. the 1st time it lasted for weeks(summer-ish of 2023) and seemed to fix itself. and it also wasn't fixed with 1 or 2 FF updates because i was waiting to see after updates that it would be fixed but wasn't. And I can't find Firefox running in Windows or advanced system care task manager. which means i cant close it manually. so I'm pretty sure it's a Firefox system problem... somehow FF is still running hidden in the background. i run malware fighter and anti virus to see if something is using it but comes up empty.