The three rectangular portion in the middle of a new TOR tab
Tor is based on Firefox. In Firefox, these three rectangular boxes are used to show Highlights. Which means , in these boxes, there will be links which were visited by the user. But, in tor these three box are useless. They just do not serve any purpose. It should work like Firefox(I have showed that in the mockups).
These three rectangular portions are ruining the UI of the browser. If they have any purpose then it should perform those. And if they do not have any use, then it should be removed to give the UI a better look.
