While you can download older builds manually going back to the first Firefox, they won't have the latest security updates.Īside from the security updates included, you'll most likely not even notice that Mozilla Firefox ESR is a few builds behind. It's for anyone who needs to use a previous build of Firefox safely.
Note: You won't be able to sign in to Mozilla Support using Firefox version 52.9.0esr or older. No further security updates will be provided for those systems. In other words, Mozilla Firefox ESR is designed to be three versions behind the current official release but with the latest security updates. Firefox has ended support for Windows XP and Vista Firefox version 52.9.0esr was the last supported release for Windows XP and Windows Vista. Mozilla Firefox ESR (Extended Support Release) is a long term support build of Firefox updated roughly every 42 weeks for major changes and every 4 weeks for minor changes.
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