Examine source code of DuckDuckGo Maps

{
  "manifest_version": 2,
  "name": "DuckDuckGo Maps",
  "version": "1.1",
  "description": "Adds a 'Maps' tab to DuckDuckGo to quickly find where you need to go.",
  "icons": {
    "48": "ddgm48.png",
    "96": "ddgm96.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.duckduckgo.com/*"
      ],
      "js": [
        "ddgm.js"
      ]
    }
  ],
  "options_ui": {
    "page": "options.html"
  },
  "permissions": [
    "storage"
  ],
  "applications": {
    "gecko": {
      "id": "ddgm@de.de"
    }
  }
}