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Hidden Mail Compose Prefs

"other header" pref ("mail.compose.other.header")
The format for this a comma delimited list of mail headers, like "Approved,X-No-Archive"

An example for your prefs.js would be:
user_pref("mail.compose.other.header", "Approved");

This will cause "Approved" to show up in the compose window address picker, under To:, Cc:, Bcc:, Newsgroup:, etc.

For example:

Approved header example image

When that mail gets sent,
Approved: test@test.com
will be in the message in the headers.

This is a useful trick for newsgroup moderators who want moderate from mozilla.