https://support.mozilla.org/en-US/kb/firefox-has-ended-support-32-bit-linux Firefox 145.0 and later has dropped support for 32-bit Linux. The most updated version with security fixes you can use is Firefox 140 ESR currently at 140.9.0esr. and the last planned update will be Fx 140.15.0esr on August 18, 2026. You can download the current 32-bit Linux version of Fx 140.9.0esr at https://www.firefox.com/download/all/desktop-esr/linux/ > Pick language > Download now. With the tarball version make sue where ever you put the untared Firefox folder that it has read/write permissions for the user to get internal Firefox updates from Mozilla much like the macOS and Windows version does.