I installed it, and typed "map" into firefox search, and firefox showed a map of London. I changed the coordinates to my Seattle location in the addon, and tried again. It used to show my area when I typed "map", but now nothing I can do gets result in any map but london as the default. Uninstalling it, rebooting the pc, search my home address repeatedly...... same result. The Addon had no effect on anything else I tried it on.