In message , Mark
Twain writes:
Sorry, I have FF version 57.0.2 (64 bit)

From what you and Ken say, it may be the new version
of FF that may be causing this intermittent problem.

I checked the last comment on the link and I'm very
iffy about going into about:config because I may screw
things up royally.

I tried going into Safe Mode but it never did. I pressed
F8 repeatedly at intervals and the MBR appears but nothing
happens. I tried this several times.

Thoughts/suggestions,
Robert

Sometimes when people talk about safe mode in the context of Firefox,
they don't mean rebooting Windows, only restarting Firefox with add-ons
disabled (which is an option under the Help menu in Firefox). No F8
required.
--
J. P. Gilliver. UMRA: 1960/1985 MB++G()AL-IS-Ch++(p)Ar@T+H+Sh0!:`)DNAf

Lewis: ... d'you think there's a god?
Morse: ... There are times when I wish to god there was one. (Inspector Morse.)