Developers have to stop believing that their web application is the centre of universe.
These days, I easily have ten tabs open in Firefox (or my browser of choice at that moment). Nothing infuriates me more than clicking a link on a website and having another window launch... except if the new window is resized automatically.
That behaviour resizes the whole window and all tabs in it. When the offending tabs is closed, a manual maximisation is required. That annoys the hell out of me.
Optus does this on their Pay a bill (click to be annoyed) link.
Stop it!
