Examine source code of Emoji Riddle Bar

{
  "manifest_version": 2,
  "name": "Emoji Riddle Bar",
  "description": "Toolbar bar shows emoji riddles (e.g. 🐱 ➕ 🎩). Change every 10 minutes. User can type answer in popup.",
  "version": "1.0",
  "permissions": [
    "storage"
  ],
  "browser_action": {
    "default_title": "Emoji Riddle Bar",
    "default_popup": "popup.html",
    "default_icon": {
      "48": "icons/icon-48.png",
      "128": "icons/icon-128.png"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "icons": {
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "emojiriddle-88a0bb02@example.com",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}