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How to close one copy of Firefox so I can use it, please.

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Please tell me how to get to using Firefox, please? As it says a copy of Firefox is already open. Only one copy can be open at a time. I am unable to locate duplicate Firefox to delete it? Please help! I do like Firefox when I can use it, but now am absolutely locked out of internet because of this.

Please tell me how to get to using Firefox, please? As it says a copy of Firefox is already open. Only one copy can be open at a time. I am unable to locate duplicate Firefox to delete it? Please help! I do like Firefox when I can use it, but now am absolutely locked out of internet because of this.

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If your crash doesn't happen in Troubleshoot Mode, it is most likely because an extension, theme, or hardware acceleration is causing the crash. Follow the steps in Troubleshoot extensions, themes, and hardware acceleration issues to solve common Firefox problems to determine the cause.

Regards, Will

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