Good point. In a related note I really wish the download manager was implemented differently anyway. Having it as a seperate window is a nuisance and all of the addons that try and solve this seem to be buggier than a native solution. Particuarly on Windows 7, getting to that Downloads window seems tedious (forever hitting ctrl-j).

Secondly, do people need to customise their addons often enough that tools is given such visual importance?

I suppose it has to go somewhere, since there is no menu bar. The tools button could be toned down, like the XP mock-ups, but still, it is quite nice.