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Sometimes when I just closed Firefox for security purposes and when I try to open new browser, "it states, Firefox is still running and you must close it first" That is not so, Why is this?

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This happens quite often. I "x" out the browser when I am at a banking site, etc and when I try to re-open Firefox the message clearly states: "Firefox is already running and you must close it before you can open a browser and/or you must re-start your system." This error surely must appear on others attempting the same thing.

This happens quite often. I "x" out the browser when I am at a banking site, etc and when I try to re-open Firefox the message clearly states: "Firefox is already running and you must close it before you can open a browser and/or you must re-start your system." This error surely must appear on others attempting the same thing.

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