Examine source code of Wandering ProgressTracker

{
  "manifest_version": 3,
  "default_locale": "en",
  "name": "__MSG_extension_name__",
  "description": "__MSG_extension_description__",
  "version": "0.5.0",
  "icons": {
    "48": "images/icon.png",
    "96": "images/icon.png",
    "128": "images/icon.png",
    "256": "images/icon.png",
    "512": "images/icon.png"
  },
  "background": {
    "scripts": [
      "dist/background.js"
    ]
  },
  "host_permissions": [
    "*://wanderinginn.com/*"
  ],
  "content_scripts": [
    {
      "js": [
        "dist/content.js"
      ],
      "css": [
        "dist/wpt.css"
      ],
      "matches": [
        "*://wanderinginn.com/*"
      ]
    }
  ],
  "action": {
    "default_popup": "public/popup.html",
    "default_icon": {
      "16": "images/icon.png",
      "19": "images/icon.png",
      "32": "images/icon.png",
      "38": "images/icon.png",
      "48": "images/icon.png",
      "72": "images/icon.png"
    }
  },
  "permissions": [
    "storage"
  ],
  "options_ui": {
    "page": "public/settings.html",
    "open_in_tab": true
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "wanderingProgressTracker@somedomain.com"
    }
  }
}