[tremon]

> YouTube is an example of a site that Firefox has trouble handling

That's fully on Google. I use plenty of other streaming sites where Firefox handles full-screen video just fine. Coming from the web search company that penalizes the rest of the Internet for slow-loading pages, Youtube is basically an embarrassment and I'm convinced this is completely intentional.

It's gotten so bad that I don't even try to watch Youtube in-browser any more; when someone posts a link that I think might be worth the effort, it goes straight into youtube-dl and I'll watch it offline or not at all.