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CloseReview for TB Header Tools Extension by Ray Stevens
Rated 4 out of 5 stars
I use this primarily to edit subject lines, and I find it very useful.
To use, look for "Change Header Details" in the Message pull-down menu from the main tool bar.
As mentioned in a previous review, there is a simple hack to enable for TB 3.0. You can get a copy of rev 0.7.1 with this hack here:
http://forum.addonsmirror.net/index.php?showtopic=1906&st=0&gopid=38064&#entry38064
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