Examine source code of Instagram watcher

{
  "manifest_version": 2,
  "name": "__MSG_extName__",
  "homepage_url": "https://facenook.com/realrecordzLab",
  "description": "__MSG_extDescription__",
  "default_locale": "en",
  "permissions": [
    "https://www.instagram.com/*",
    "https://*.cdninstagram.com/*",
    "tabs"
  ],
  "icons": {
    "16": "icons/16.png",
    "48": "icons/48.png",
    "128": "icons/128.png"
  },
  "background": {
    "scripts": [
      "js/background.js"
    ],
    "persistent": false
  },
  "browser_action": {
    "default_title": "__MSG_extName__",
    "default_icon": {
      "19": "icons/19.png",
      "38": "icons/38.png"
    }
  },
  "version": "2.0.2",
  "content_security_policy": "script-src 'self' ; object-src 'self'"
}