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nstmp files in Thunderbird - what do they do, and how can I delete them?

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Hello I have nstmp files in my Thunderbird account that are holding huge amount of emails. I think this is slowing down my computers overall operating speed. What function do these files serve, and how can I delete these files? Thank you

Hello I have nstmp files in my Thunderbird account that are holding huge amount of emails. I think this is slowing down my computers overall operating speed. What function do these files serve, and how can I delete these files? Thank you

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These happen sometimes with compacting is interrupted. You can delete them.