Since the Oct 7 Firefox update (105.0.3 ) for Mac, I've experienced slowdowns and freezes that affect Finder operations as well as Fox. I have a M1 iMac 27" running MacOS12.6. It goes away by when I close and restart Firefox and/or do Mac maintenance with Onyx. Because the effect is progressive, starting mild and getting worse, I think you've got a memory leak. I 1st noticed it in a 30-tab environment. I'll see if it affects my Mac-Air running an earlier MacOS