I recently had updated flash player and all the browsers just stopped responding when any flash content was on the page. This kept happening for all the browsers,
Updating the flash player and the browser does not help. After a lot of searching the culprit was found to be the hardware acceletation setting of the new flash player.
Go to this site: http://www.adobe.com/software/flash/about/.
Right click on the Flash logo, Settings,
then UNcheck the hardware acceleration in Display Settings.
If that doesn’t solve it, you may need to update your video card driver also.
If everything is right the flash animation will show up on the page mentioned above. And you will not face issues with the video sites like youtube and all.