An instance of Google maps open to look at a city or region and know its layout. An instance of a Wikipedia page open to the region or place I'm writing in, and additional pages open to anything else I feel might be helpful in writing. And if I need it I may be perusing the character tab of the RP to read the notes I keep in my character/nation sheet.

This is alongside my usual tab flair to the likes of YouTube and my dA. But they're not important.