[iaskwhy]

In their defence, that's how windows usually work on (err...) Windows 7, apps usually have the top bar and sometimes something more where transparency is allowed (there's a system setting for setting the amount of transparency, or none).

I don't see a problem since the tabs are not transparent, just with a small gradient like Chrome, and it's probably not going to be possible to add things (icons from extensions?) to the main controls of the browser.