Examine source code of QuickMapsSearch

{
  "manifest_version": 2,
  "name": "QuickMapsSearch",
  "version": "1.0",
  "description": "Quickly search a location on Google Maps by right-clicking on any webpage and selecting 'Search on Google Maps' from the context menu.",
  "icons": {
    "48": "icons/googlemaps.png"
  },
  "permissions": [
    "contextMenus"
  ],
  "background": {
    "scripts": [
      "quickmapssearch.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{993fa18e-f458-49ae-a842-1b985c17b456}"
    }
  }
}