Created attachment 663498 [details] screenshot: Edge of tab bar with aero, TB 15.0.1 Using Thunderbird 15.0.1 on Win7 with Aero: the tab bar has a vertical gradient that shades the aero glass; this extends all the way to the left and right edge of the window. This means that the edge of the window doesn't blend in with the glass border of the window. I think that the left and right edge should have a radial gradient edge which extends full glass to the corner.
Created attachment 663695 [details] [diff] [review] patch I tried with radial-gradient but this doesn't fit well with the linear-gradient. Changed to a background image. On maximized window the gradient goes from end to end.
Comment on attachment 663695 [details] [diff] [review] patch Code and UI looks good!
Comment on attachment 663695 [details] [diff] [review] patch This is some polish we might want to consider for TB 17.