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Thunderbird: Configurable "Save as" *.eml default filename format (without an addon)

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For some time now already, Thunderbird is forcing us to use a very unwanted feature - appending unnecessary text to the *.EML filenames, when e-mails are being saved to disk via "Save As". See the attached image.

A decades old default has been removed and it is not possible to turn this feature off or set a different default. Please do not suggest add-ons. This should be configurable by default, without introducing any need for (potentially insecure) add-ons.

So, even if turned on by default, can you add an option to turn it off? It should not be hard (+1 "if" statement somewhere in the code). Can you make it optional? (A parameter somewhere in the Config Editor would be great!)

Please?

For some time now already, Thunderbird is forcing us to use a very unwanted feature - appending unnecessary text to the *.EML filenames, when e-mails are being saved to disk via "Save As". See the attached image. A decades old default has been removed and it is not possible to turn this feature off or set a different default. Please do not suggest add-ons. This should be configurable by default, without introducing any need for (potentially insecure) add-ons. So, even if turned on by default, can you add an option to turn it off? It should not be hard (+1 "if" statement somewhere in the code). Can you make it optional? (A parameter somewhere in the Config Editor would be great!) Please?
Attached screenshots

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A screenshot attached - the desired (can be optional) default.

A simple "SUBJECT.eml" filename.

That's it.

Please.

Thank you in advance!