mail.strip_sig_on_reply Setting Is Broken
I've checked mail.strip_sig_on_reply option in my Thunderbird advanced settings and it is still set as true (default) but signatures are not being stripped in replies when they start with -- (dash dash space) above.
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You're using the right option. I've seen this happen, the signature block detection is not perfect, perhaps the email format (HTML vs plain text) matters or perhaps the signatures are not "-- "? (the space is important).
You are correct, the sig stripping does seem to work only on plain text messages. However, since nearly all messages are formatted these days - including both Yahoo Mail and Gmail - it makes this feature pretty useless doesn't it?
You make a point, I wish this was 100% accurate and worked with all HTML emails :)