Enable thunderbird to add a signature in black colour and without the double dashes

[AThunderBirdUse]

Hi, the current signature one can add by default to Thunderbird is noticeably a signature.

For the many emails I send due to my job the possibility to add a signature (and an incipit) in black colour, indistinguishable from the rest of the text would be quite useful for time management, since I must conclude (and start) with a bunch of formalities that vary little-to-nothing one from another.

Thank You for reading

Thunderbird 

[Jon]

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