Examine source code of steam_dogecoin

{
  "manifest_version": 2,
  "name": "steam_dogecoin",
  "permissions": [
    "https://api.coingecko.com/*"
  ],
  "version": "1.2",
  "description": "Converts games prices in steam from usd to dogecoin",
  "icons": {
    "48": "d.png"
  },
  "applications": {
    "gecko": {
      "id": "curetv.2006@gmail.com",
      "strict_min_version": "45.0"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "*://store.steampowered.com/*"
      ],
      "js": [
        "temp.js"
      ]
    }
  ]
}