this my debug info.... why cant i play youtube videos in Mozilla Firefox v13.0.1 and i have latest version of adobe flash

debug info:

stacktrace=null&ts=1340905046&cl=31482712&debug%5FplaybackQuality=medium&videoFps=0&droppedFrames=0&debug%5FflashVersion=WIN%2011%2C3%2C300%2C262&stageFps=10&debug%5Fdate=Thu%20Jul%205%2022%3A02%3A05%20GMT%2D0400%202012&debug%5FvideoId=emmVElYkyXA&debug%5FsourceData=