Examine source code of SEO Error Detector

{
  "manifest_version": 2,
  "name": "SEO Error Detector",
  "version": "1.0",
  "description": "Automatically detects and reports SEO errors.",
  "permissions": [
    "activeTab"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "32": "icons/logo_32.png",
      "64": "icons/logo_64.png",
      "128": "icons/logo_128.png"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{3c306168-81d4-4865-bf47-95f793a94756}"
    }
  }
}