Bug: Open enough tabs to fill the tab bar, say 15 tabs, take the last one and drag and drop it to move it over, it will jump to the first page worth of tabs (say between 1st and 10th), so you can't move the 14th tab to be the 15th position.

Using the scroll wheel on a mouse could move along the tab bar (as firefox does)

Forward and Backward buttons on the mouse could step between active tabs (as Notepad++ does)