Examine source code of SeoToolNew

{
  "manifest_version": 2,
  "name": "SeoTool",
  "version": "6.0",
  "permissions": [
    "cookies",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {},
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "popup.js"
      ],
      "run_at": "document_end"
    }
  ]
}