On Monday, June 22, 2020 12:48:49 PM rhkra...@gmail.com wrote: > Ahh, the problem seems to be gone in a clean profile, so I may spend some > time in the old profile disabling add-ons and plugins. (I don't have that > many, don't know if I have to restart after each -- maybe I'll disable > them all, restart firefox, and then add the ones I really want back one at > a time.
Ok, the problem seems to have been due to a plug in named YouTube Plus. I actually worked the other way, I disabled plugins one at a a time, without restarting Firefox. YouTube Plus was the second one I disabled and the problem went away (on a new page with a newly loaded youtube video). If I had disabled all the plugins with no change, then I would have restarted FireFox and then, assuming the problem was gone, start re-enabling plugins one at a time.
