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Firefox was working just fine but the last few days it won't let me open it because it says it's already running but it's not how do I close it to open it?

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This is the message I get whenever I click on the Foxfire icon on my computer. Even when it has been down for hours:"Foxfire is already running, but is not responding. To open a new window, you must first close the existing Firefox process, or restart your system."

This is the message I get whenever I click on the Foxfire icon on my computer. Even when it has been down for hours:"Foxfire is already running, but is not responding. To open a new window, you must first close the existing Firefox process, or restart your system."

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