Firefox ESR is expressly for enterprise users, and represents more of the static version of the browser, with updates happening only once in a year, against the six-weeks standard feature update for regular Firefox browser.
The legacy Firefox ESR 52, now replaced by Firefox ESR 60, which made debut in May, and is scheduled for discontinuation and also support for all the compatible legacy extensions in next two weeks.
While the company had extended support for the ESR version to allow customers more time to migrate from version 52 to version 60, it will halt the support for Firefox Extended Support Release (ESR) 52, which is the final release that's compatible with the legacy add-ons, on September 5, 2018.
As Firefox ESR 52 remains the final version that support legacy add-ons, Mozilla had also planned to remove those extensions from the market place.
According to Mozilla, since no supported versions of Firefox will be compatible with the legacy add-ons after this date, the process of disabling legacy add-on versions on addons.mozilla.org (AMO) will commence in September. And starting September 6, 2018, new submissions for legacy add-on will be disabled.
All the legacy add-on versions will become disabled by early October, 2018 and users will no longer be able to find extension on the AMO portal.
Mozilla recommends that legacy add-on developers should visit the wiki page for more information about upcoming developments and ways to get in touch with the team for help.
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