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How do you close Firefox to update it?

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I tried to update Firefox and started, then it said, "Firefox must be closed to proceed with the installation. Please close Firefox to continue." ...... how do I close it? Can't they make this easy?

I tried to update Firefox and started, then it said, "Firefox must be closed to proceed with the installation. Please close Firefox to continue." ...... how do I close it? Can't they make this easy?

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File > Exit