It would be useful to be able to define the background shading / coloring of the active tab and/or alternating tabs. If each tab had a different color it'd be a little easier to keep them separated logically (when there are many) without having to concentrate on the names, especially if the names are similar. Thanks for the great app!

That's actually on my to-do list. I'm thinking something similar to the colored tabs in IE. You could set it by the favorite folder or individual tab basis. It won't be the next release, but it is on the to-do list.