The main reason to hide title bar for me is the possibility to not care about Y direction of mouse pointer when I clicking on tabs. Because, in Chrome its tabs start from the TOP of the screen. BUT!!! In this add-on there is a still 1 pixel distance between the top of the screen and the tab!! And I must care about Y position of a mouse pointer to it will not be at this 1 pixel line on the top, it must be little bit down to I can click on tab. And this is VERY bad.