Any idea why some Youtube videos stopped working for me (Firefox)
 

It started last week i think. 1 out of 3 videos i check just doesn't do anything anymore.

Is the screen black or green?

1) Right click on youtube video.
2) Click Settings
2) I get these tabs: Display, Privacy, Local Storage, Microphone and Camera.
3) Under Display, I UNCHECKED the 'Enable hardware acceleration' tickbox.
4) Refeshed and works fine now.

White.

Let me try that.

Are you using any GFY ignorelist plugins? that might be related lol

If you right click on where the video should be, does it show the player menu?