Examine source code of Simple NAVCoin Ticker

{
  "manifest_version": 2,
  "name": "Simple NAVCoin Ticker",
  "short_name": "NAVCoin Ticker",
  "description": "This extension shows latest price ticker of NAVCoin from coinmarketcap.",
  "version": "0.4resigned1",
  "browser_action": {
    "default_icon": "images/nav-coin.png"
  },
  "background": {
    "scripts": [
      "javascripts/background.js"
    ]
  },
  "options_ui": {
    "page": "options.html",
    "chrome_style": false
  },
  "permissions": [
    "https://api.coinmarketcap.com/"
  ],
  "icons": {
    "128": "images/nav-icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{d6a2a637-0e79-4d34-a336-4a8b57f1ea7a}"
    }
  }
}