Maps with very large dimentions Popup Message

This popup message appears whenever the page settings menu for a 100x100 size map is accessed. “Maps with very large dimentions may load slowly or not at all. Do you wish to continue?” How do I turn this annoying pester popup off? The large maps I use are simple battle maps that load just fine. After all, a Pathfinder Fireball has a range of easily 175 - 5 foot squares. On one occasion this message locked up Firefox. I just need to know how to turn it off completely. Thanks

An option to disable it could be nice, since it always pop up even after changing music or other VERY mundane operations, like disabling line of sight. I manage to survive by pushing OK all the time, but not everybody has my patience, I feel for them.