The current version 55 is a little slower than Chrome on my 3 year old phone, but performance in the past few major versions has definitely improved. The nighty developer build of Firefox 57 absolutely flies.
Mozilla is doing an amazing job with their Firefox modernization, it's a shame how little attention it gets on Android.
Video Background Play Fix https://addons.mozilla.org/en-US/firefox/addon/video-backgro...
I think a better question is why would a talk/podcaster be using YouTube for distribution?
Browser block popups, forcefully enable right-click on sites that disable it, browsers allow users to forcefully enable zoom, or background playback.
And just like that, browsers should also allow users to forcefully enable PiP.
Too bad Mozilla won't ever dare to defend themselves from Google's bullying and will happily accept having background playback on YouTube, until now one of the primary motives for people to try Fennec out, being taken away.
https://bugzilla.mozilla.org/show_bug.cgi?id=1355407
RESOLVED WONTFIX