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I’m annoyed

can't open thunderbird

I get this error message when I try to open Thunderbird. "Thunderbird is already running, but is not responding. To open a new window you must first close the existing Thunderbird process, or restart your system."
Restarting the system doesn't change anything. There is no visible Thunderbird process in the task manager to shut down. Is there a file for Thunderbird in the task manager that does not have the Thunderbird name?
This seems to be a common problem with the newest version of Thunderbird judging by the number of instances on the internet of this same problem.
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