Hasta la Vista

In approximately March, 2017, Windows XP and Vista users will automatically be moved to the Firefox Extended Support Release (ESR).

Firefox is one of the few browsers that continues to support Windows XP and Vista, and we expect to continue to provide security updates for users until September 2017. Users do not need to take additional action to receive those updates. In mid-2017, user numbers on Windows XP and Vista will be reassessed and a final support end date will be announced.
In the meantime, we strongly encourage our users to upgrade to a version of Windows that is supported by Microsoft. Unsupported operating systems receive no security updates, have known exploits, and are dangerous for you to use. For planning purposes, enterprises using Firefox should consider September 2017 as the support end date for Windows XP and Vista.
For more information please visit the Firefox support page.

via the blog.
Any Windows XP or Vista user on a release channel NOT using a previous ESR and upgrading from a version prior to v52 can be upgraded directly to ESR 52.0.0 (once it becomes available); that is, their channel will be switched to ESR

Any Windows XP or Vista user on a release channel using ESR 45.8.0 can be upgraded directly to ESR 52.2.0 (once it becomes available)
and in my email, via Peter Dolanjski Product Manager, Firefox Mozilla
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