When signing into a account that I use on a regularly I was told to update my browser and am recieving different answers regarding the correct version

Latest version is '''152'''.0.6 currently, however that requires at least macOS Catalina 10.15 to run. The most recent your old Mac can run is '''115'''.37.0esr which is still getting at least the most critical security fixes and will be supported for a few more months, but it's not gaining any new support, functionality, or compatibility changes some of the sites may require. See [[Firefox users on macOS 10.12, 10.13 and 10.14 moving to Extended Support Release]] for more info relevant to your macOS High Sierra 10.13 system.