Examine source code of Website Logo Puzzle

{
  "manifest_version": 2,
  "name": "Website Logo Puzzle",
  "version": "1.0",
  "description": "Collects favicons from open tabs and turns them into small jigsaw-like puzzles you can solve in the popup.",
  "permissions": [
    "tabs",
    "storage"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_title": "Logo Puzzle"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{d030a438-7ab7-4a89-a54f-81a099a4e125}"
    }
  }
}