To the developer: Thanks a lot. I have only a few suggestions.
Why don't you allow us an option to change the opacity of the titlebar?
I have placed many buttons on the titlebar, but not all of them are properly visible because they appear as opaque. Some buttons like forward, back,bookmarks drop-down button and history drop-down button can't be found anywhere on the internet customized with color to be seen on the titlebar.
It is not the color of the titlebar as being the problem, it is just that firefox default buttons do not get along with being placed in the titlebar, so they appear as opaque. Probably something to do with windows aero, I presume.
P.S. this add-on is 1 of the top add-ons that keeps me staying with Firefox.