For past few weeks, I am facing a problem, whenever I try to open an YouTube video from google search it dose not play. When I click on play/pause button or press spacebar, the video plays for one frame and then again pauses. But the video plays fine, If I search youtube.com and open a video from there, I am don't understand why this is happening, I tried restarting firefox and I also restarting my pc, but that is also not working.