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When I close Firefox I cannot reopen it without restarting my computer.

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If I try to re-open Firefox I get the message already open close or restart your computer.

If I try to re-open Firefox I get the message already open close or restart your computer.

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Try to Wait a bit longer before reopening Firefox to give Firefox more time to close completely.

Use "Firefox/File > Exit" (Mac: "Firefox > Quit"; Linux: "File > Quit") to close Firefox if you are currently doing that by clicking the close X on the title bar.

See "Hang at exit":

See "Firefox hangs when you quit it":