Firefox Failure FacePlant

User Agent: Mozilla/5.0 (X11; Linux x86_64; rv:66.0) Gecko/20100101 Firefox/66.0

Steps to reproduce:

Wait until it's past midnight on 2019-05-04 UTC.

Actual results:

All addons got disabled due not having valid signature.

Expected results:

If the signature was due to expire, it should have been renewed weeks ago. Not all extensions were disabled. Fakespot and Google Scholar Button were left in their disabled state.

Some reports on reddit 1 says that they had their clocks a day forward, but they may be just early canaries for the actual widespread issue.

Going backwards in time allows installation from AMO but do not remove the unsupported mark from the add ons already installed.

https://bugzilla.mozilla.org/show_bug.cgi?id=1548973