There should be another bug landing soon (hasn't landed yet)
https://bugzilla.mozilla.org/show_bug.cgi?id=1311420
Unfortunately 52, besides being a very long cycle, is also a release
with a lot of changes (deprecated support for NPAPI plugins, last
version with XP support).
There's also going to be messaging around Windows XP support, but
details are still being discussed.
Francesco