Does it still happen in Troubleshoot Mode?

First of all, kudos to zeroknight for getting me on the right track; suggesting I start with safe mode.

I think we're on the right track. One extension seemed to be the issue, however, so far the problem still appears to be on again off again...maybe. I've cleared the cache, reduced the number of unneeded registrations; and previously completely uninstalled and reinstalled Firefox (myself, and a 2nd time with a microsoft tech remotely).

When I disabled all the extensions, the issue clear up promptly. Also, part of the on again off again could be associated with hardware acceleration. Although I"m not sure about that either.

At this point, I'm going to wait a couple of days...too much going on including a medical test Wednesday AM.

Also, for now, if you have any additional suggestions, let me know.

UPDATE: when I use the troubleshooting method, i.e, WHAT HAPPENS is it appears to be trying to work, but it's on again, off again, with more than one extension appearing to be the problem, and is not consistent. Very mystifying. The only time the problem is completely fixed appears to be when I close all the extensions. (So far.) HELP!!!!

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When I open YouTube, the search videos all show an image. Then when I select one, for the last two days now, that ("front page) image is gone - although the video plays OK.

When I us my Chrome browser the video I've selected begins playing the instant I open the video; even when I've opened the link in a new tab.