This makes sense. You have a 2010 Mac which only supports up to High Sierra. On macOS, use Firefox ESR 115 which still receives security updates. Alternatively, you can use Boot Camp, install Windows 7/8.1 depending on your model, and unofficially upgrade to Windows 10. You should be able to run the latest version of Firefox and many other software there. Be sure to make a backup if you go this routeThis is not about Mac's running M1 processors. You don't seem to release that is the latest processor.This is about old Mac's 2010 or so that cannot install upgrade to the latest running version of firefox and are forces to run ESR which does not have all the latest features.
https://support.mozilla.org/en-US/kb/firefox-users-macos-1012-1013-1014-moving-to-extended-support
The mozilla document above is not in any way related to Mozilla because as I said a Catalina Mac running on Intel processor is capable of running windows in Bootcamp which allows the latest version of Firefox. But the old Mac OS Catalina and other deprecated operating systems cannot run the latest for some unknown reason.
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