Examine source code of TennisGraph

{
  "manifest_version": 3,
  "name": "TennisGraph",
  "version": "0.4.0",
  "description": "View your match schedule and plan upcoming matches.",
  "browser_specific_settings": {
    "gecko_android": {
      "strict_min_version": "142.0"
    },
    "gecko": {
      "id": "{6607fb7f-14c1-46e7-8ff2-2cb0bb0ccf89}",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "personallyIdentifyingInfo",
          "websiteContent"
        ],
        "optional": []
      }
    }
  },
  "action": {
    "default_popup": "popup/index.html",
    "default_icon": {
      "16": "icons/icon-16.png",
      "48": "icons/icon-48.png",
      "128": "icons/icon-128.png"
    }
  },
  "background": {
    "scripts": [
      "background/index.js"
    ],
    "type": "module"
  },
  "content_scripts": [
    {
      "matches": [
        "*://leagues.ustanorcal.com/*",
        "*://tennisgraph.com/*",
        "*://www.tennisgraph.com/*"
      ],
      "js": [
        "content/storage-observer.js"
      ],
      "world": "MAIN",
      "run_at": "document_start"
    },
    {
      "matches": [
        "*://leagues.ustanorcal.com/*",
        "*://tennisgraph.com/*",
        "*://www.tennisgraph.com/*"
      ],
      "js": [
        "content/index.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "permissions": [
    "cookies",
    "storage"
  ],
  "host_permissions": [
    "*://leagues.ustanorcal.com/*",
    "*://tennisgraph.com/*",
    "*://www.tennisgraph.com/*"
  ]
}