Youtube not working on Firefox - Lots of people around the world reporting same thing! February 18th 2015.

Just checked Youtube and it's not working, all i'm getting is a black screen with a spinning circle.
Have checked downdetector.com and Isitdownrightnow.com and lots of other people around the world reporting the exact same problem even though Youtube is playing fine for them on other browsers like Chrome.
I'm fully up to date both on my Firefox and Flash and Youtube was working fine for me yesterday.
Is this some Firefox problem? as thousands of people around the world are having same problem.
Thanks in advance.

For other users finding this topic in the future:
1) Enter the config by typing about:config in the adress bar.
2) Enter media.mediasource.webm.enabled and press enter.
3) Right click on it and change to true, for some reason it is set as "false" which makes MSE & WebM VP9 not work properly.
4) Visit: https://www.youtube.com/html5 and check that everything is OK.
5) Try to watch a video. It should work now.

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