I can't wach video on youtube

View times a go, I open my Mozzila and  I would like to watch a video on youtube, but went I open it there just a blank.

And the solution is go to the mozzila toll bar and chose tools/add ons/ get add ons/ and type youtube player on the searching bar then instal youtube flash player

And than we can watch the video on youtube.
The easy way for we all