''CarolineOH [[#question-1216785|said]]'' <blockquote> I want to install above so I can download free upgrade to High Sierra. Can’t set up support forum account on laptop so using IPhone. Fire fox says operating system too old to allow Fire Fox. Any solution? </blockquote> Correct to old. Please visit the OS X forum or a forum that will provide in formation on the version you are running as to what you can use. https://support.apple.com/en-ca/HT201475 Please let us know if this solved your issue or if need further assistance.