You can probably get something like chrome using "Hide Caption Titlebar Plus" (https://addons.mozilla.org/de/firefox/addon/hide-caption-tit...) to hide the titlebar and put the windows button directly into the window. You can even use Stylish to customize those button (so they'll fit your theme).
I don't like the window decorations of most window managers. Openbox allows users to set keyboard shortcuts, customize a menu that's always a couple of keystrokes away, and the window decorations can be customized as well. It's worth tolerating, but I spend a lot of time in my browser. I've been spoiled by Chrome, and now I don't want to switch away.
That said, there are a couple of other things that keep me on Chrome such as its element inspector.