Rated 5 out of 5 stars

Very useful. Thank you.
Very minor problem. On Win XP SP3, TB11.0, default theme, the horizontal divider line between (below) the mail toolbar and (above) the tab bar is missing. I put it back with the following CSS.


#mail-bar3 {
border-bottom-style: solid !important;
border-bottom-width: 1px !important;
border-bottom-color: rgb(128, 128, 128) !important;
}
#tabs-toolbar {
border-top-style: solid !important;
border-top-width: 1px !important;
border-top-color: rgb(255, 255, 255) !important;
}

This review is for a previous version of the add-on (1.0.0.0). 

I fear such a change might break support for other themes. Probably I can find a way to let it apply only on the default theme, through, but I'm not sure about inserting anything into the theme's buissness. I'm not sure about personas (never used them), too. I fear there are situations in which it might look more terrible than without the border. I like your userchrome solution, through (although the color names can be better, there's threeDShadow and threeDHighlight).
If you agree I think it would be a good idea to publish a changed version in tutorial-form in the add-ons description.
Feel free to contact me via eMail to discuss the issue, as the rating platform wasn't made for discussing. I added the missing support email (I forgot that I need to set it for each new add-on individually).