Good Ghu! Every time Mozilla/FireFox comes up with another release, it seems we are left pursuing the bloody marbles across a variable gravity floor! The problem here (in 58.0) is that now I can no longer play YouTube videos... says that if the bluidy thing doesn'a play, to start the device again. I don't know what that means at all. Do I start the Firefox program by exiting it and then restarting it? (Ay. that's of nae use at all...) Do I restart Windows? (Oi, what a pillock THAT one is!) No matter what I do, I keep getting shunted about ("Delete (this) and re-install (that) and NONE of it useful! I explored Mozille Help and thought I'd found the solution until I realised it was from March of 2017 nd didn'a apply to this disast.... release number. I really need to get this resolved as I'm buying a house and many of the renovations I want to accomplish are contained in YouTube posts (Which I can't fekin' play, d'ye ken?) and it's makin' me madder than a drunken Cymrii !) So: WHY can't the YouTube files play the way they did prior to the latest update? WHICH fool thought that this would be a "good idea" to implement on our unsuspecting Personae? WHO put the "Bomp" in the "Whomp-a-bomp-Bomp?" WHO put the "Whang" in the "Whang-a-lang-a-ding-dong?" Nothing I desire towards him/her has anything to do with shaking his (her) hand, I assure you.