Hello, since your I have donwloaded your latest Firefox update I have multiple issues with Firefox 147.0.4 on macos Tahoe version 26.3 If you google "using firefox on mac os tahoe 26.3" you will see that I am not alone. I have been using Firefox for many years, and do not understand why newer Firefox versions are not fully tested before being released on the "market". You are not alone; Google has also the same problem on macos Tahoe version 26.3. Might be good to contact Apple to solve this issue,before a domino effect! Cordially Michael