Examine source code of Steam Profile 64-bit ID

{
  "manifest_version": 2,
  "name": "Steam Profile ID",
  "author": "Jexs",
  "version": "1.0",
  "description": "Shows the 64-bit Steam ID of any Steam profile on the right sidebar.",
  "homepage_url": "https://github.com/Jexs/SteamProfileID",
  "developer": {
    "name": "Jexs",
    "url": "https://github.com/Jexs"
  },
  "icons": {
    "48": "icons/steam48.png",
    "96": "icons/steam96.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.steamcommunity.com/profiles/*",
        "*://*.steamcommunity.com/id/*"
      ],
      "js": [
        "profileid.js",
        "lib/jquery-3.4.1.min.js",
        "lib/jquery.animate-colors.min.js"
      ]
    }
  ],
  "permissions": [
    "clipboardWrite"
  ]
}