Examine source code of Map Switcher

{
  "manifest_version": 2,
  "name": "Map Switcher",
  "description": "Switch between different map services. Convert coordinates and directions and jump to the same location on another map.",
  "version": "0.4.7",
  "options_page": "html/options.html",
  "browser_action": {
    "default_icon": {
      "19": "image/mapswitcher19x19.png",
      "38": "image/mapswitcher38x38.png"
    },
    "default_popup": "html/mapSwitcher.html",
    "default_title": "Map Switcher"
  },
  "permissions": [
    "activeTab",
    "storage",
    "downloads",
    "clipboardWrite"
  ],
  "icons": {
    "16": "image/mapswitcher16x16.png",
    "32": "image/mapswitcher32x32.png",
    "48": "image/mapswitcher48x48.png",
    "128": "image/mapswitcher128x128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{a2c1b663-5969-4a68-8081-ce7855b45acd}"
    }
  }
}