I don't use Facebook, so I don't suffer from it's awful pop-over widget and dialog box design, but I know what you mean, I've seen people messing with it. Certain flash-based pop-over adds on certain website can be annoying because hitting the "X" to close them is near or outright impossible to get at, but it's small price to pay if you want to escape the default browser. I do, though very little, from time to time, use the stock browser and view mobile versions to escape these stupid adds...