Center-click = new window.
Can't seem to default things to open as a new tab.
The options say, ctrl-click and ctrl-shift-click should open in a new tab. It works sometime, but if I'm opening something from GMail, it still opens in a new window.
I have to right-click and then tell it to open in a new tab, if I want it to work that way.
Otherwise, I'm happy with just about everything, excluding how it handles rich formatting on blackboard. (But that's not huge.) And I can't center-click to close a tab, but with the X on the tab, that's not huge either.