I find it very annoying that every time I click on the Opera program icon in the task bar, I am presented with a set of thumbnails of tabs currently open, rather than just maximising the bloody window. Why the hell do I have to go through an extra mouse-click to get to my window?
I suspect that this setting is useful in some niche cases. But I am yet to encounter any of them. That said, Microsoft have - thank dog - in their infinite wisdom, deigned to include a toggle for this setting. The following steps should outline how to turn this bleeding enhancement *cough* off: