Doesn't seem to be working with the latest T-bird.

[meeotch]

Noted several issues with the current version. Unfortunately, I don't have time atm to run down which of these are related to each other or do further debugging, so I'm just going to paste the review that I posted on mozilla.org:

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Seems like a great idea, but isn't currently working for me. I tried applying mango's fix, but the Spam Rating column is still coming up empty. My x-spam-status headers look like this:

Yes, score=7.4

Also, I noticed that the option dialog has an Advanced tab that seems to anticipate the lower case issue:

function toLowerCase() { [native code]}

But trying to save options gives an error:

"The header you entered contains an invalid character, such as ':', a non-printable character, a non-ascii character, or an eight bit ascii character."

Presumably related to the brackets in the default value - but there's no indication how to correctly implement lowercasing.

Also, trying to use the add-on on an IMAP mailbox results in the following lines being added to your prefs.js:

user_pref("mailnews.customDBHeaders", "function toLowerCase() {\n [native code]\n} function toLowerCase() {\n [native code]\n} function toLowerCase() {\n [native code]\n}");
user_pref("mailnews.customHeaders", "X-Spam-Status: X-Spambayes-Classification: Bcc: X-PHP-Script: X-Spam-Score: Return-path: functiontoLowerCase(){[nativecode]}: functiontoLowerCase(){[nativecode]}: function toLowerCase() {\n [native code]\n}");

which breaks IMAP access! (And doesn't go away when you uninstall the add-on.) Beware of this - you'll need to revert those lines by hand to regain access to the IMAP box(es) it broke.

Finally, there are a couple options related to showing the score and rules (!) in the message that seem to have no effect for me. The latter sounds really cool. Too bad none of this is working. Here's hoping for an updated version soon.