FWIW,
I reset Firefox back to the original settings, losing all my configuration and add-ons (not too big of a deal, takes about 10 minutes to set it back up) and I haven't had the security patch malware pop up again.
There is a price to pay using Firefox over other browsers but I'm old and I stick with what I know...even if its often not in my best interest to do so.
Probably why I've been married so long.