The same thing happened to me when I recently upgraded to Firefox 3.6.3, my Ubuntu is 10.04. Previously flash was working perfectly. But now I can see blank white area in the video clips section in youtube. I checked "about:plugins" in firefox. The page shows that no plugin is installed.
Now I opened Tools > Add-ons > Plugins
So when I checked the Firefox Plugins section as mentioned above, to my surprise I saw that all the plugins mentioned there, were actually disabled by default. Same with Shockwave Flash 10.0 r45 too. After I enabled it, Youtube started working. This was Funny!
The same thing happened to me when I recently upgraded to Firefox 3.6.3, my Ubuntu is 10.04. Previously flash was working perfectly. But now I can see blank white area in the video clips section in youtube. I checked "about:plugins" in firefox. The page shows that no plugin is installed.
Now I opened Tools > Add-ons > Plugins
So when I checked the Firefox Plugins section as mentioned above, to my surprise I saw that all the plugins mentioned there, were actually disabled by default. Same with Shockwave Flash 10.0 r45 too. After I enabled it, Youtube started working. This was Funny!