Examine source code of JKLM Overlay+

{
  "manifest_version": 2,
  "name": "JKLM Overlay+",
  "version": "1.0.0",
  "description": "An overlay for JKLM.",
  "background": {
    "scripts": [
      "service-worker.js"
    ],
    "persistent": false
  },
  "permissions": [
    "storage",
    "tabs",
    "https://*.supabase.co/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://jklm.fun/*",
        "*://*.jklm.fun/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "overlay-plus@jklm.fun",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "applications": {
    "gecko": {
      "id": "overlay-plus@jklm.fun",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}