Examine source code of Sitechecker.pro

{
  "manifest_version": 2,
  "name": "SiteChecker PRO Chrome Extension",
  "description": "SiteChecker PRO Chrome Extension",
  "version": "1.1resigned1",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": "icon.png",
    "default_title": "Click here!"
  },
  "permissions": [
    "tabs",
    "activeTab",
    "storage"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{5f33d06b-ca5e-4d6f-9221-4a2e4d85aff8}"
    }
  }
}