and I loathe simplistic flat or "material" designs & interfaces. However, you didn't do much. Anyway, the most important part is that you forgot to include the dark sections for the bottom & side of the browser for anyone who uses those parts (usually via addons. There are a huge amount of us) and thus renders it useless to people who are trying to rid their screen of the dreaded, hideous white crap. It's why a lot of us look for personas, to get rid of it. Otherwise it's nice.

Looks like I'm setting out on a great adventure!