Rated 4 out of 5 stars

This is BETTER than TB Reset Quote Headers. There is one problem though. When replying or forwarding, the Re: or Fw: or Fwd: used in the original message is removed. Also it would be cool to be able to change the %date% to 12 hour AM/PM.

This review is for a previous version of the add-on (0.4.3). 

It seems that the subject provided through TB's nsIMsgDbHdr service has no Re:, Fw:.
I fix this problem in next version.
And, I can not support AM/PM, because I do not know the form in each country.