Examine source code of STR Score

{
  "manifest_version": 3,
  "name": "STR Score",
  "version": "1.0",
  "description": "Shows a value score for STR listings: price×1000 ÷ (stars × reviews). Lower = better value.",
  "icons": {
    "48": "icon48.png",
    "96": "icon96.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.airbnb.com/*"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "widget.css"
      ],
      "run_at": "document_idle"
    }
  ],
  "host_permissions": [
    "*://*.airbnb.com/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "str-score@nargothrond.pub",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}