https://www.mozilla.org/en-US/firefox/organizations/ https://www.mozilla.org/en-US/firefox/organizations/ Extended Support Release They're released on a much

https://www.mozilla.org/en-US/firefox/organizations/ https://www.mozilla.org/en-US/firefox/organizations/ Extended Support Release They're released on a much slower schedule (once a year) and get security fixes backported. They're intended for big organizations that don't want 6-weekly updates and are willing to live with outdated software. But obviously its also handy if you want to fork and can't deal with re-basing every 6 weeks. Especially if you don't intend to update your fork a lot. You still get the free security fixes.