MutantMaps Firefox toolbar

The MutantMaps Firefox toolbar is a web browser toolbar that makes it easy to shift between map servers without losing information about where you are located, i.e. the shift preserves longitude, latitude, zoom level.

As of 2005-11 the supported map servers included: Google Maps, MSN Virtual Earth, MultiMap, TerraServer and 192.com, along with 'mashup' sites such as the examples at googlemapsmania. One of these lets users avoid speed traps using information exchanged by drivers in the UK. This is a good example of how Troll Age systems work, enabling scofflaws more than authorities. Such a toolbar is called a trollbar by Craig Hubley.

The candidate portal of openpolitics.ca itself could make good use of exactly this capability.

Refer link from the developer