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I receive a message when closing out my banking site saying browser has prevented application from closing properly. What to do?

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I have no other problem with FireFox. Just this one site that says it is being prevented from closing out properly and to close the window tab. I'm assuming the problem is a setting that needs changed

I have no other problem with FireFox. Just this one site that says it is being prevented from closing out properly and to close the window tab. I'm assuming the problem is a setting that needs changed

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Do you mean that you close Firefox and that Firefox crashes?

See Firefox crashes when you exit it