Examine source code of RSSPreview

{
  "manifest_version": 2,
  "name": "RSSPreview",
  "version": "1.0.0",
  "description": "Preview RSS/Atom feeds directly in the browser with a clean, readable layout.",
  "permissions": [
    "activeTab",
    "storage"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content_script.js"
      ],
      "run_at": "document_end"
    }
  ],
  "applications": {
    "gecko": {
      "id": "rsspreview-4gylg2@example.com",
      "strict_min_version": "109.0"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "rsspreview-4gylg2@example.com",
      "strict_min_version": "109.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}