Examine source code of Freedium Redirect

{
  "name": "FreeBlogs",
  "description": "Navigates the current page to Freedium",
  "manifest_version": 2,
  "version": "1.0",
  "icons": {
    "256": "icons.png"
  },
  "permissions": [
    "tabs",
    "scripting",
    "activeTab"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": []
    }
  ],
  "background": {
    "scripts": [
      "free.js"
    ]
  },
  "browser_action": {
    "default_icon": "icons.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{1cffee5e-b119-43d9-8064-9922f77bb594}"
    }
  }
}