Youtube sometimes makes my flash plugin crash. Though I can't 100% predict when it will happen, I have found that whenever I have 2 tabs open with a youtube video and I go full screen on one tab and close the tab afterwards (going back to the other tab), my flash plugin will crash every time. After I close the tab my firefox will completely freeze for ~1 minute, and when it starts responding again all flash videos on the tab will tell me my flash plugin has crashed. I can then refresh the tab and everything will be fine.

I have tried searching google with different keywords but so far have been unable to find someone with the exact same problem. None of the answers on this site have been any help.