Completely bizarre behavior that I cannot explain or find any google matches for. When I enter a search term in Mail, I don't even have to hit enter, it shows up in Firefox's search field as soon as I make Firefox the active application (iMac desktop). It happens if I have the Firefox search bar open, or if I open it (Cmd-F) afterwards. It happens in Private Browsing. E.g. if I clear the Firefox field, go to Mail, type some letters into the search field, as soon as Firefox becomes the active window, the search term is populated. I will entertain any explanation or suggestion, whether based in reality or not. FWIW I'm running Malwarebytes unpaid version so I have some sorta protection. For FF extensions I have Ublock origin, FB Purity, and FB container. I tried turning them off; no change. I didn't try restarting FF after turning them off though, too many tabs needed right now. thanks, jim