It's not just any "couple of pixels" that can make a crucial difference in the UX. It's not about the number of pixels, it's about moving the tab bar to the edg

It's not just any "couple of pixels" that can make a crucial difference in the UX. It's not about the number of pixels, it's about moving the tab bar to the edge of the screen that matters. See http://www.codinghorror.com/blog/2006/08/fitts-law-and-infinite-width.html http://www.codinghorror.com/blog/2006/08/fitts-law-and-infin... Yes obviously Google was not the first one to put that principle to some use, but their browser was the first one among web browsers. Personally I hated how Opera left a few pixels gap between the tabs and the screen edge (I have no idea if they still do). A few pixels was just enough to make sure that I had to move the mouse cursor a little bit back every time I wanted to click on a tab.