When my son the techie got home from work we talked this over and he suggested that there have been so many updates to Firefox lately that it was possible I got a corrupt file. He had me uninstall the whole thing and then re-install from Mozilla's home page. Seems to have worked. The only add-on I added is AdBlock Plus.
So far so good. It works and no miracles involved!
So far so good. It works and no miracles involved!