Rated 4 out of 5 stars

Thank you very much Ray Stevens for this version 0.7.1. I cannot use Thunderbird without this add-on!

But I have one problem:
When an email message is opened, and I want to edit the subject, I click on "Message/Change Header Details". Then the "Header Changer" window opens, but in the background, the original email message that was opened disappears, and the very first message in the mailbox appears in its place. Then, when I close the "Header Changer" window, the original message that I was editing reappears. Did anyone have the same problem? Any clue to fix that?

Other than that, everything works perfectly. Thank you! This is a wonderful extension!