Examine source code of Coinbase - Coin

{
  "manifest_version": 2,
  "name": "Coinbase - Coin",
  "description": "This extension shows latest price of Stellar (XLM) in BTC.",
  "version": "1.0.9",
  "icons": {
    "16": "images/icon16.png",
    "48": "images/icon48.png",
    "128": "images/icon128.png"
  },
  "browser_action": {
    "default_icon": "images/ubq.png"
  },
  "permissions": [
    "notifications"
  ],
  "web_accessible_resources": [
    "images/ubq.png"
  ],
  "background": {
    "persistent": true,
    "page": "background.html"
  },
  "options_page": "options.html",
  "browser_specific_settings": {
    "gecko": {
      "id": "{f7bcc6a5-63ec-4637-86b4-6272c2d9850f}"
    }
  }
}