Problem solved. Turns out that even after uninstalling Firefox via both IObit and Comodo Programs Manager, plus using BleachBit to shred all the files both missed....there was still four files hidden away that the start/search function found. BleachBit then failed twice to delete them, so I had to delete them from the recycle bin. I was then able to re-install Firefox 52.3.0, clean and in working order. Firefox and Opera are like dang malware when it comes to giving either the boot, but at least I didn't have to pay the tech guy to purge it (like with Opera).
So now we will see if no bookmarks solves the real problem of why Firefox is sooooo shabby:
1. Firefox has encountered a problem and needs to close.
2. Firefox is not responding
3. Firefox is still running (after having closed it).
If not, it will be time to send that fox to the pound for some euthanasia. I managed to re-install Centaury, sans previous audio problem, so worst case scenario...Mypal and Centaury will be good enough. Would of liked to have gotten Basilisk, but another try at 7zip failed again!