Keep the downloaded package so you can reinstall, just in case. After you download it and before you install it, disconnect from the Internet until you get it installed and have turned off automatic updates. However, when ESR updated to v60, it ignored my settings and updated anyway. I had my system locked into v52 ESR for the same reason as you, and thought I had disabled updates.

There is some basic coverage of these options hereĪssuming you know all of the risks and are still intent on sticking with an old Firefox, read the part in the first link about disabling automatic updates. The popular options are Waterfox, Pale Moon, and Basilisk. Just to toss this out there, there are some Firefox spin-offs that still support the legacy add-ons but are maintained so as not to be sitting ducks for exploits. Verify that your legacy add-on is still available and supported (many add-on developers dropped legacy support and either re-coded for the new standard or threw in the towel). They even recommend going to a competitive browser rather than downgrade. They go through a page of reasons why it's a bad idea because it is insecure, and a host of alternatives. The reason there are two ESRs at any time is to provide a substantial double-up period between versions, so you are never stuck with taking on new features just to get security fixes – there’s always an overlap during which you can keep using the old ESR while trying out the new ESR to get ready for the necessary switchover in the future.See this Mozilla article about installing an old version. Similarly, for ESR 91.13, we have 91+13 = 104, to make it clear that although version 91 is still back at the feature set from about a year ago, it’s up-to-the-moment as far as security patches are concerned. So, for ESR 102.2, we have 102+2 = 104 (the current leading-edge version). The ESR version numbers combine to tell you what feature set you have, plus how many security updates there have been since that version came out. To any poor soul who happens upon this thread, I came across this article which affirmed that this is confusing and incidentally answered my question well after the factĪs we’ve explained before, Firefox Extended Support Release is aimed at conservative home users and at corporate sysadmins who prefer to delay feature updates and functionality changes, as long as they don’t miss out on security updates by doing so.

Older versions of firefox esr