Examine source code of Comfort Pet

{
  "manifest_version": 2,
  "name": "Comfort Pet",
  "version": "1.0",
  "description": "A virtual pet to comfort users who are feeling down.",
  "permissions": [
    "storage"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "icons/icon.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "icons": {
    "48": "icons/icon.png"
  },
  "web_accessible_resources": [
    "pets/dog.png",
    "pets/cat.png",
    "pets/rabbit.png",
    "pets/panda.png",
    "pets/chicken.png"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{271ff02d-aa97-437d-ae36-6e4c065ca002}"
    }
  }
}