Feature Request: Overhaul Firefox UI elements like bookmark and download manager to match the rest of Zen's UI

[AWH1122]

Really enjoy the browser, but when I access things like the download manager or bookmarks manager and see the standard firefox UI, I get pulled out of it slightly.

I can understand that these areas probably see much less traffic than others, but in my opinion it would make the browser feel a lot more polished if they were changed to follow the design language of the rest of zen. Below are some images of what I'm referring to:

[Zylaah]

Pretty sure something is already in the works, called "Zen Library".