删除Thunderbird默认签名分割符的两条横线

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默认的Thunderbird设置签名后，会在新建邮件时在前面自动添加两个短横线，类似：

--
xxxxxx

如果要去掉这两个短横线分割符，需要在 工具-> 选项-> 高级-> 配置编辑 中，将 mail.identity.default.suppress_signature_separator 配置项的值修改为 true。即可去掉分割符。

原文在 Signatures - Thunderbird

If you don’t want a “– “ signature separator (the divider between the message body and the signature)
use the config editor to change mail.identity.default.suppress_signature_separator from false to true.
This requires Thunderbird 5.0 or later. If you are using Windows go to Tools → Options → Advanced → General
and press the Config Editor button. Enter suppress_signature_separator in the Filter: field and press return.
Find mail.identity.default.suppress_signature_separator in the results and double click on false in its Value column
to toggle it to true, then close the config editor and press the OK button.