Examine source code of Wplace Theme Changer

{
  "name": "Wplace Theme Changer",
  "version": "1.1.0",
  "manifest_version": 3,
  "description": "Easily override the Wplace map style with your own custom JSON theme.",
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "storage"
  ],
  "host_permissions": [
    "https://maps.wplace.live/styles/*",
    "https://wplace.live/styles/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "https://wplace.live/*",
        "https://maps.wplace.live/*"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "icons": {
    "16": "icon.png",
    "48": "icon.png",
    "128": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "wplace-theme-changer@github.com.Frenxys",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}