Examine source code of Desmos Dark Default

{
  "manifest_version": 2,
  "name": "Desmos Reverse Contrast Default",
  "version": "1.0.1",
  "description": "Enables Reverse Contrast by default on Desmos Graphing Calculator.",
  "icons": {
    "48": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "desmos-dark-default@RinkyDinkyNooble",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "https://www.desmos.com/calculator"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://www.desmos.com/calculator*"
      ],
      "js": [
        "script.js"
      ],
      "run_at": "document_end"
    }
  ]
}