I have tried youtube html5 player by opting it in from here But i dont find html5 youtube player as good as flash player. So i opted out from same link despite of opt-out youtube was showing videos in HTML5. I tried
- Deleting Cookies
- Deleting firefox profile
- Deleting .mozila directory from home
- Uninstalling and reinstalling firefox
But still problem persist and it is really annoying. Meanwhile i installed chrome and i am getting flash player in chrome but no luck in firefox. Please help me.