Examine source code of Edit this Image

{
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": {
      "38": "assets/icon_38.png"
    }
  },
  "applications": {
    "gecko": {
      "id": "jid1-WuwyZI99lCtePA@jetpack",
      "strict_min_version": "57.0"
    }
  },
  "content_security_policy": "script-src 'self'; connect-src *; default-src 'self'; child-src * data:; img-src * data:; style-src 'self' 'unsafe-inline'; font-src 'self' data:;",
  "description": "Quick and easy access to image editor tools.",
  "developer": {
    "name": "ulmdesign"
  },
  "homepage_url": "http://www.mediamaster.eu/contatti/",
  "icons": {
    "38": "assets/icon_38.png",
    "128": "assets/icon_128.png"
  },
  "manifest_version": 2,
  "minimum_chrome_version": "38",
  "name": "Edit this Image",
  "permissions": [
    "tabs",
    "<all_urls>",
    "contextMenus"
  ],
  "short_name": "Edit all Images of Web Page",
  "version": "2.1.0"
}