I can see how what you mentioned can be used to make popups and other stuff in j a v a s c r i p t that could cause trouble on GFY. What you found is a good find. But you really made it more than it really is. It can't do most of the stuff you mentioned.
Being able to change the password by having the cookie sent to you cannot be done. At least without asking the client permission before it is actually sent. It could be done with old browsers (I'm talking about the really old ones on Win 95 machines). But most newer browsers won't let emails be sent via j a v a s c r i p twithout permission from the client first.
Sending out emails via j a v a s c r i p tused to be a big problem in the early days. That's how emails were harvested. That has since been fixed for some years now.
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