Examine source code of WebSafe365

{
  "name": "WebSafe365",
  "description": "WebSafe365 Parental Control",
  "version": "1.0.8",
  "manifest_version": 2,
  "permissions": [
    "background",
    "notifications",
    "tabs",
    "https://websafe365.com/*",
    "storage"
  ],
  "background": {
    "scripts": [
      "js/common.js",
      "background.js",
      "js/scripts.js"
    ],
    "persistent": true
  },
  "browser_action": {
    "default_popup": "welcome.html",
    "default_icon": "websafe-365-logo.png"
  },
  "icons": {
    "16": "logo16.png",
    "48": "logo48.png",
    "128": "logo128.png"
  },
  "commands": {
    "_execute_browser_action": {
      "suggested_key": {
        "default": "Ctrl+Shift+F",
        "mac": "MacCtrl+Shift+F"
      },
      "description": "Opens welcome.html"
    }
  },
  "content_security_policy": "script-src 'self'; object-src 'self'"
}