I am intending to stop offering Fennec updates when Fennec itself is
installed manually instead of via the Google Play store.
More details are at https://github.com/mozilla-releng/releng-rfcs/pull/13
or in rendered form at
Please contain (most) comments to the markdown on github.
I intend to implement this on autoland/central as of Feb 5, 2019 and allow
it to ride the trains to release.
~Justin Wood (Callek)