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compatible Mac OS

Firefox Installer
James replied
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Can I use om Mac 10.11.16

Can I use om Mac 10.11.16

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James
James
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https://support.mozilla.org/en-US/kb/firefox-mac-osx-users-esr

Unless your hardware allows you to update your macOS to 10.12, 10.13, 10.14 so you can use the current Firefox 115 ESR, the most current version of Firefox you can run on macOS 10.11 is Firefox 78.15.0esr.