Examine source code of Coin Ticker

{
  "manifest_version": 2,
  "name": "Coin Ticker",
  "description": "A minimal crypto ticker in the browser: watchlist, daily change coloring and a badge with the price you care about.",
  "version": "1.1.4.1",
  "browser_specific_settings": {
    "gecko": {
      "id": "{d766b466-fb46-44b5-9070-430e00df4cd4}",
      "strict_min_version": "101.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "icons": {
    "32": "images/icon-32.png",
    "48": "images/icon-48.png",
    "64": "images/icon-64.png",
    "96": "images/icon-96.png",
    "128": "images/icon-128.png"
  },
  "permissions": [
    "storage",
    "https://api.coingecko.com/*"
  ],
  "background": {
    "scripts": [
      "scripts/core.js",
      "scripts/background.js"
    ]
  },
  "browser_action": {
    "default_title": "Coin Ticker",
    "default_popup": "scripts/popup.html",
    "default_icon": {
      "32": "images/icon-32.png",
      "48": "images/icon-48.png",
      "64": "images/icon-64.png",
      "96": "images/icon-96.png",
      "128": "images/icon-128.png"
    }
  }
}