When you click on a new link, there is an "explosion" animation on the tab where it turns entirely blue for a second. This happens every time you click a link. I'm finding this extremely distracting. I'm sensitive to this kind of stuff so I always try to disable animations on everything I can.

The top bar is also black-ish now rather than the system grey. This looks particularly bad with the new "blue" highlight indicator. The tabs are all square rather than rounded. It all looks pretty hideous.