Open the current location from Google Maps/Earth in Shadowmap and vice versa.
Shadowmap Location is an extension that allows you to open the current location in Shadowmap with one click in Google Maps. The whole thing also works in the other direction. With a click on the extension icon you can display the current location opened in Google Maps/Earth in Shadowmap.
Shadowmap Location only needs access to the active tab. The extension extracts longitude and latitude from the URL of the active tab and opens Shadowmap/Google Maps/Google Earth in a new tab.
You can always "view the source" of Shadowmap Location the way you do any Chrome extension, or view the source code on Github: