Firefox + Youtube HTML5
Using Firefox 39.0a2, YouTube HTML5 has been working fine for me (including at 60fps) for ages, though I think I had a similar issue several months ago, which has now been fixed. Try following the guide that I made for enabling 60fps YouTube in Firefox to make sure that your browser supports everything properly.
You might also want to try disabling hardware acceleration - http://lifehacker.com/disable-firefoxs-hardware-acceleration-to-fix-slowness-749344037has the instructions on how to do so.
Finally, if you go to about:addons or press Ctrl+Shift+A, then go to the plugins tab, to you have the Open H.264 video codec plugin installed and set to always activate? It should install by default, but it is possible that it may not have installed for some reason.


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