Examine source code of Favicon Viewer

{
  "manifest_version": 2,
  "name": "Favicon Viewer",
  "version": "1.0",
  "description": "Show all favicon links from the current page.",
  "icons": {
    "64": "icon64.png",
    "128": "icon128.png"
  },
  "permissions": [
    "activeTab"
  ],
  "browser_action": {
    "default_title": "View Favicons"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{6bfff2f9-27e7-4827-a9ff-d02ab5d45f56}",
      "strict_min_version": "104.0"
    }
  }
}