Rated 4 out of 5 stars

Somewhat helpful add-on; however, as noted, it's writing to the local TBird database and doesn't really -change- the subject line of the eMail. It's this latter feature that would be much more useful as, once I move to another machine, whatever changes I made on PC#1 don't appear on PC#2. As well, when I had some trouble (not related to this add-on) that required I trash my TBird profile and start over, all the changes I made were gone. (TBird 73.x)

{edit:080220} I understand wiping out the profile and re-generating will lose the edits to the local database. I just located the "Options" checkbox that, if unchecked, says it will write the changed Subject line directly to the eMail (which is what I would prefer so changes appear on all devices accessing the eMail). But is there any danger in doing this? I only use IMAP mail. Thanks for any assistance you might provide.

Đánh giá này là cho một phiên bản trước của tiện ích (4.2). 

Glad you found the option. There is no danger in using it together with IMAP.