To me this screams "hey! Our data says 'X'! Let's apply it in the simplest way possible, with little to no editing or afterthought, and then bask in the false confidence our data provides."
I'm not saying that their approach is a bad idea, but they've allowed their execution to falter. They're still in the idea phase. This is not a 'product' phase.
1. It's visually noisy. The problem is not necessarily that there are shitloads of buttons, but that they're everywhere. We have an area for buttons on the top right, then an area of tabs, then an area of large, poorly-gridded buttons, then another row of buttons on the address bar area. Oh, and the freaky tab-above-the-tabs thing on the title bar. There's no visual organization or hierarchy. The whitespace and value is all monotone. When you squint your eyes, all you see is buttons, and no organization behind them.
2. Look, I'm sorry, it's ugly. I'm not saying you need to go stick-up-the-ass Apple brushed metal. Just...after you've worked out the usability aspects, hire a graphic designer. They're really good at all those tiny little visual tweaks that can make the difference between 'eh' and 'great'. UI/UX people usually don't have the chops to accomplish that - you need a dedicated artist.
3. In the words of Dr. Malcolm, "Yeah, but your scientists were so preoccupied with whether they could that they didn't stop to think if they should." All right, your solution appears to be "more buttons". Take that a little farther. How many is enough? Can you have 'too many buttons'? (hint: yes) Do you want to distinguish visually between commonly-used and uncommonly-used buttons? Is it safe to draw this conclusion from your data? How representative of the average user's needs are these after-market add-ons that will probably only be installed by power users?
Look, data is useful, but poorly-analyzed data is dangerous. If you're not careful it will sing you whatever song you desire, whispering "yes, yes, more like that" in your ear as you dance down to hell.