Examine source code of VU Map Terrain

{
  "manifest_version": 2,
  "name": "VU Map Terrain",
  "version": "0.3",
  "description": "Displays visual-utopia.com hidden map terrain.",
  "icons": {
    "16": "favicon-16x16.png",
    "32": "favicon-32x32.png",
    "96": "favicon-96x96.png",
    "256": "favicon-256x256.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://visual-utopia.com/*"
      ],
      "js": [
        "jquery-3.6.0.min.js",
        "terrain.js"
      ],
      "run_at": "document_end",
      "all_frames": true
    },
    {
      "matches": [
        "*://visual-utopia.com/build.asp*"
      ],
      "js": [
        "jquery-3.6.0.min.js",
        "build-view.js"
      ],
      "run_at": "document_end",
      "all_frames": true
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{53f914b6-7644-4525-8b3a-783df5056a31}"
    }
  }
}