Since you appear to be using the old macOS 10.14 the most current Firefox you can run is Firefox 115.32.0esr which you appear to have and used to post this support forum thread. Firefox 115.33.0esr out on Feb 24 is going to be the last update for the old Fx 115 ESR channel. https://support.mozilla.org/en-US/kb/firefox-users-macos-1012-1013-1014-moving-to-extended-support If you can update your macOS to 10.15 (ten.fifteen) or later then you will be able to run the current Firefox 147.0.2 Release or the Firefox 140.7.0esr.