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Totally Lost - Firefox running, not responding - old Firefox process must be closed to open new window

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So I bought a new computer. Installed Firefox and Thunderbird. Thunderbird will not open links properly in the Firefox browser. I get the following message: "Firefox is already running, but is not responding. The old Firefox process must be closed to open a new window." However, other links open fine. The browser that is open is working fine. I have gone to the point of refreshing firefox and opening with no extensions, and the same thing happens. I seem to have checked every setting that I have found information online and nothing changes the behavior. One idea was to reinstall Windows but I just bought the computer so that is a silly option as everything else is working just fine and running at a blistering rate.

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