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Modifying Thunderbird tags

There is no good way to modify or delete tag definitions from the Thunderbird UI. The tag definitions are stored in prefs.js [mozillazine] in lines such as

user_pref("mailnews.tags.receipt.color", "#C0C0C0");
user_pref("mailnews.tags.receipt.tag", "Receipt");

in this case "receipt" is the name of the tag (the string that gets put into the mail header) and "Receipt" is what you see in thunderbird, and the highlight color is #C0C0C0, which is a light shade of gray.
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