Hello Hoping someone can help me with this asap. I was prompted to update firefox on my mac laptop. So I did the update by clicking the button available at the top of the firefox browser, but now I can not open Firefox at all. When I click on the firefox icon it does not open firefox and this message appears: You can't use this version of the application "Firefox with the version of OS X. You have OS X 10.11.6 . The application requires OS X 10.12 or later. I understand what this means but not sure how to revert back to the previous version of firefox. When installing the new update/version of firefox, i have deleted the old version of firefox. I am following these instructions currently to try to resolve it: https://www.wikihow.com/Downgrade-Firefox Following the instructions above I went to: https://ftp.mozilla.org/pub/firefox/releases/ , but can not find the previous version of firefox that I need. The only info I have on firefox is version 102.2.0. I am after the version before this as assume that is the one compatable with my laptop currently (i can not update the OS ). Can you help me download the previous version so it is compatable with my mac laptop? Thanks for your help in advance