Every time I try to open Firefox I get a popup saying it is already open, and to close it or restart; but it is NOT open, and restarting doesn't help.
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Question Every time I try to open Firefox I get a popup saying it is already open, and to close it or restart; but it is NOT open, and restarting doesn't he
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- Continue here - https://support.mozilla.com/en-US/questions/880054