Rated 3 out of 5 stars

Version 1.1 of this theme had 3 internal names set. One was in the chrome.manifest and two were in install.rdf. It does not work if you do it that way. The internal name has to be consistent between those two files, and there is no point in putting more than one internal name line in install.rdf. That file works better with a different format anyway. The first time I modified it, I copied the format from the theme Early Blue, and that still works.

Rated 3 out of 5 stars

There needs to be an internal name set up in install.rdf and chrome.manifest, otherwise it turns into a clone of SeaMonkey Modern when one updates the application. This is what I did in install.rdf to give it one:
<em:internalName>graymodern</em:internalName>
In chrome.manifest, I put the name into each line that begins with "skin"; for example:
skin messenger graymodern chrome/modern/skin/modern/messenger/

This review is for a previous version of the add-on (1.0). 

Rated 3 out of 5 stars

How about making the backgrounds for the toolbar buttons transparent? I think they would look better.

This review is for a previous version of the add-on (1.0).