Do you know that RAM oxidation can cause youtube playback problems? I've just fixed my problems by cleaning my ram sticks!
I was sure that the new firefox 40 was the problem. To make it worse in chrome the videos were not lagging at all, but when I restarted my computer it failed to restart properly. I saw this kind of problems with ram sticks before so I said to give it a try. The sticks were very hot and one of them showed signs of oxidation. I've cleaned them with a eraser and now the computer works great again.
I have 4gb ddr2 800 adata vitesta in 4x1gb sticks.
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Additional System Details
- Next Generation Java Plug-in 11.31.2 for Mozilla browsers
- Shockwave Flash 18.0 r0
- User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:41.0) Gecko/20100101 Firefox/41.0
Good work. Well done.