At some point you will have come across a website that resizes or moves your browser, sometimes it can be in the form of those annoying popups. I recently came across this when watching a news stream from Japan covering the Fukushima nuclear plant.
Well here's how to stop those sites hijacking your browser positioning.
Click Tools, then scroll down to Options.
Select the tab Content from the top.
Uncheck the first option Move or resize existing windows.
That's all there is to it. You can test by loading this site.