Why doesn't Adobe Flash Player work even if it is installed?

I keep downloading adobe flash from many places including adobe and it still doesnt work on Firefox. Example: I cant see youtube videos because it asks for that. And yes, java and javascript do work. Oddly, it works in internet explorer and not firefox. Am i missing something on firefox or do i need to do something in order for firefox to detect that and let me see videos there?
 
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