Rated 4 out of 5 stars

I tried this, but decided to use the original for the actual deleting, because it allows me to delete the larger duplicate, and this one doesn't. Also, most of the features the author of this addon says are missing from the original are not actually missing, except for maybe the license and the toolbar button menu, neither of which I care about nor looked at on either extension.

This review is for a previous version of the add-on (0.3.12). 

In the review dialog, sort by the number of lines or by the message size, and you can keep the largest/smallest message by "Keep First"ing or "Keep Last"ing That certainly is a feature.

Also, the missing features in the original were missing when I started work on this. I had wanted to join forces and collaborate, but the author of the original never bothered to return my emails...