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#1
I wouldn't worry about it, in some rare instances it just happens. Reload the page and off you go. (This is why the Firefox team moved plugins into a separate process called plugin-container.exe, so it wouldn't take the browser down with it)
Try this. Go with right click on video,select Settings and there uncheck Enable hardware acceleration. Also follow this guide to remove flash player and install again latest version to see...
I really don't know that,but I have readed that on YouTube forums I think,where lot of people say that after unchecking that they don't have any problems with Flash Plugin.