As of three days ago I am unable to play any videos from any web sites. It just stopped working after the latest FF update. I have reset Firefox, deleted cookies and, any addons, disabled Use hardware acceleration. Allow audio and video is selected. I have tried all the fixes I could find on Google and yet nothing makes anything play. It just gives a black screen and spins. I can play videos find on any other browser.

Other switching to Chrome I am about to give up. Help?