With MUI IE I don't have any issues with 1080P on youtube.
I tried the newest version of Firefox and I think it's garbage. When they decided to drop development for the MUI version it became even worse.
I used to use it as my only browser but now I stay with MUI IE. It's fast, secure and doesn't seem to have any problems rendering HD.
I use my SP3 Exclusively now. No more iShit and no more desktop or even my lap top. On my Desktop, Firefox was wonderful. On my laptop it was OK...on my Surface it was GARBAGE. Horrible to work with and see.
In 3 weeks of using MUI IE, I haven't found a site that it doesn't work with. That includes... um.. educational sites. LOL. Purely for testing purposes only.
What really pissed me off about Firefox is their reason behind cessation of development of a MUI version (which was AWESOME BTW), "It has not been download or used enough"
WTF? Most people didn't even know it was available. Most of the time, you couldn't get it to work. Maybe they should have told people how and where to use it.
Firefox lost me for good unless they develop a MUI version. Hell, most programs have lost me. I ABSOLUTELY HATE working with programs in the desktop mode now. Just hate it. If it's not an app, I won't use it. Except MS Office. That's just because I can make it act and work like an App.