Resolved: Re: Firefox shrinks to horizontal bar when viewing youtube video and scrolling vertically

[rhkramer@gmail.com]

On Monday, June 22, 2020 12:48:49 PM rhkramer@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.