Examine source code of MapSwitcher

{
  "manifest_version": 3,
  "name": "__MSG_extension_name__",
  "description": "__MSG_extension_description__",
  "default_locale": "en",
  "version": "2.1.1",
  "browser_specific_settings": {
    "gecko": {
      "id": "{0516BC41-6FA3-4326-87FE-7EA9101412FE}"
    }
  },
  "icons": {
    "16": "icons/icon-16.png",
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png",
    "128": "icons/icon-128.png",
    "256": "icons/icon-256.png",
    "480": "icons/icon-full.png"
  },
  "permissions": [
    "storage"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://*.google.com/maps*",
        "*://*.google.cz/maps*",
        "*://*.google.sk/maps*"
      ],
      "js": [
        "scripts/js/consts.js",
        "scripts/js/utils.js",
        "scripts/js/options.js",
        "scripts/js/urls/common.js",
        "scripts/js/urls/google_maps.js",
        "scripts/js/urls/mapy_com.js",
        "scripts/js/urls/open_street_map.js",
        "scripts/js/buttons/common.js",
        "scripts/js/buttons/google_maps.js"
      ],
      "css": [
        "styles/common.css",
        "styles/google_maps.css"
      ]
    },
    {
      "matches": [
        "*://*.mapy.com/*"
      ],
      "js": [
        "scripts/js/consts.js",
        "scripts/js/utils.js",
        "scripts/js/options.js",
        "scripts/js/urls/common.js",
        "scripts/js/urls/google_maps.js",
        "scripts/js/urls/mapy_com.js",
        "scripts/js/urls/open_street_map.js",
        "scripts/js/buttons/common.js",
        "scripts/js/buttons/mapy_com.js"
      ],
      "css": [
        "styles/common.css",
        "styles/mapy_com.css"
      ]
    },
    {
      "matches": [
        "*://*.openstreetmap.org/*"
      ],
      "js": [
        "scripts/js/consts.js",
        "scripts/js/utils.js",
        "scripts/js/options.js",
        "scripts/js/urls/common.js",
        "scripts/js/urls/google_maps.js",
        "scripts/js/urls/mapy_com.js",
        "scripts/js/urls/open_street_map.js",
        "scripts/js/buttons/common.js",
        "scripts/js/buttons/open_street_map.js"
      ],
      "css": [
        "styles/common.css",
        "styles/open_street_map.css"
      ]
    }
  ],
  "options_ui": {
    "page": "pages/options.html",
    "open_in_tab": false
  }
}