the new version is too new for my OS version? I have 10.11.6
i decide to update my version of Firefox and I did. Problem is the new version is too new for my computer with version of El Capitan. Computer replace the old version for the new one and now I can't open Firefox. I went looking for my old version but I cant find it.
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Firefox 79.0 and later has required MacOS 10.12 at minimum to run so you will need to upgrade to MacOS 10.12 or higher.
Fx 78.15.0esr is the most current version you can use though it is EOL. https://archive.mozilla.org/pub/firefox/releases/78.15.0esr/mac/en-US/ other locales at https://archive.mozilla.org/pub/firefox/releases/78.15.0esr/mac/
I moved this thread from "Firefox for iOS" section to "Firefox" as iOS is for iPhone/iPad.