Examine source code of Best Sublimation Map

{
  "name": "Best Sublimation Map",
  "version": "1.9",
  "description": "Finds addresses in the web page you're on and pops up a map window.",
  "icons": {
    "128": "icon.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "content_scripts": [
    {
      "matches": [
        "http://*/*"
      ],
      "js": [
        "mappy_content_script.js"
      ]
    }
  ],
  "permissions": [
    "storage",
    "https://maps.google.com/*",
    "https://maps.googleapis.com/*"
  ],
  "page_action": {
    "default_name": "Display Map",
    "default_icon": "marker.png",
    "default_popup": "popup.html"
  },
  "manifest_version": 2,
  "content_security_policy": "default-src 'none'; style-src 'self'; script-src 'self'; connect-src https://maps.googleapis.com; img-src https://maps.googleapis.com",
  "browser_specific_settings": {
    "gecko": {
      "id": "{4b2f1abd-e8a6-4955-b7cd-ef53f1596248}"
    }
  }
}