My favorite theme!
Though I have the same issue as reported by the the user 14546869: with hi-res display (2560x1440) in full-screen the blue bar where the tabs are, cuts of at the left corner of the browser window. I do not observe this behavior on FHD or lover resolution displays. As 14546869 user noted, "the graphic you used seems to be not width enough". I have the same issue also with your other theme "Gloss. Black".
Could you please adjust that?