Examine source code of DesmosLoader

{
  "manifest_version": 2,
  "name": "Desmosloader",
  "version": "1.3",
  "description": "Loads scripts in Desmos calculator webpages.",
  "icons": {
    "48": "icons/avatar-48.png",
    "96": "icons/avatar-96.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.desmos.com/calculator/*",
        "*://*.desmos.com/calculator"
      ],
      "js": [
        "desmosload.js"
      ]
    }
  ]
}