Mozilla plans to release Firefox 60 and Firefox 60 ESR on Wednesday. While Firefox 60 is just another update for users of the stable channel, the same cannot be said for ESR (Extended Support Release) installations.
Firefox 60 ESR is a major upgrade that is available as an upgrade from Firefox 52 ESR. If you follow Firefox development, you know that major changes happened in the past couple releases and especially with the release of Firefox 57.
Firefox features a new design, performance improvements, and dropped support for legacy add-ons to name just a few of the changes.
Mozilla plans to release Firefox 60 ESR on May 9, 2018. Existing Firefox ESR installations don't need to be updated to the new major version directly as Firefox 52.8 and Firefox 52.9 will be released alongside Firefox 60 ESR and Firefox 60.1 ESR.
The release of Firefox 62 and Firefox 60.2 on September 5, 2018 marks the end of the 52.x version of Firefox ESR.
Firefox 60 and Firefox 60 ESR offer identical functionality for the most part. Firefox 60 ESR supports only WebExtensions, and it supports most features that are supported by Firefox 60.
There are notable differences, however.
Firefox 60 ESR differs from Firefox 52 ESR in significant ways as well.
Administrators and users have until September before the switch from Firefox 52.x ESR to Firefox 60.x ESR needs to be made. This is true for all systems expect for devices running Windows XP or Vista as those are not supported anymore by Firefox. (via Sören)
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