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Why do I keep getting this message

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Cyclone3211
Cyclone3211
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I have been getting the following message several times: "Firefox is already running, but is not responding. The old Firefox process must be closed to open a new window. Close Firefox" I check my programs and I am only running the current version on Windows 10 Pro. Why do I get this message?

I have been getting the following message several times: "Firefox is already running, but is not responding. The old Firefox process must be closed to open a new window. Close Firefox" I check my programs and I am only running the current version on Windows 10 Pro. Why do I get this message?

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