I just put together my RPi4B/4GB with a 24" HD monitor yesterday, & put Firefox on it, & I think it is as stable as on my Intels.
One other thing, you can't download videos from YT on Chrome, they've taken that bit out of the download plugin, but the Firefox plugin still lets you, so I'm using Firefox.
(FF runs quite well, if a bit slowly on my RPi3B+ too.)