HI Kevin. Good catch. What I was originally reporting was that Malewarebytes was not detecting any problem when we received fake updates for Firefox for something called firefox.patch.js I searched for the update on your site and found nothing so I was hoping that maybe I could help you resolve the problem. There is a suggested manual removal method, however, I am not that trusting of the sources of self help.
You are correct, there is nothing in the log, but the symptom continues... Check out ....
https://support.mozilla.org/t5/Problems-with-add-ons-plugins-or/I-found-a-fake-Firefox-update/ta-p/37696
Thank you for your help. Jon Otto