Firefox will only play YouTube videos up to 720, how to fix?

This afternoon I watched an old video of mine on YouTube. Afterwards, YouTube now only gives the option of 360 or 720p playback. Internet Explorer will play the same videos at 4K, and I was able to watch 1080 up to 2160p before watching this old video, how do I fix Firefox?
http://youtu.be/Je0sQwVynzI
There's the newest video, with a 4k playback option, I don't want to post the old video that caused the glitch but it's the first video in my channel.
Please help!

After going into about:config I did 2 things:
media.mediasource.enabled set to True
then added
Right-click and select New > Boolean
Name preference media.mediasource.ignore_codecs
Set value to True
A ton of technical stuff just from playing an old video! Is there a simpler to fix this without hard setting things in the configuration?
And now I cannot replay youtube videos! It will pause if I try to go back. Considering a video will auto play so I will select the highest quality then scrub back to start this happens usually every time so this fix is worthless.

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Firefox will only buffer youtube videos alittle and I can't download anything like anti-mal/spyware.

<blockquote>Locking duplicate thread.<br>
Please continue here: [[/questions/932265]]</blockquote>
Firefox will only buffer youtube videos alittle and I can't download anything like anti-mal/spyware as it only downloads to 5% and crashes.

Try to disable the hardware acceleration in the Flash Player.
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* http://www.macromedia.com/support/documentation/en/flashplayer/help/help01.html
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*https://support.mozilla.org/kb/Safe+Mode
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'''''Do NOT click the Reset button on the Safe Mode start window.'''''
https://support.mozilla.org/kb/Safe+Mode
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Firefox will only play YouTube videos up to 720, how to fix?

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