Could you provide some information for me?
The signatures in Mozilla Thunderbird are blocks of text that are automatically attached to every message that the users send (including both new messages and replies to). These are generally used to provide additional contact information, legal terms or some other information that is relevant to every email. If you want to know how to configure and use signatures in Thunderbird please consult the link below: https://support.mozilla.org/en-US/kb/signatures