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When I close Nightly 11, I can't reopen it until I restart my computer.

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Why is this happening and how can I stop it from happening? It's been happening since I downloaded Nightly 9, and I have been continually updating it, but it still happens.

Why is this happening and how can I stop it from happening? It's been happening since I downloaded Nightly 9, and I have been continually updating it, but it still happens.

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See "Hang at exit":

See "Firefox hangs when you quit it":