Examine source code of CSS Ref

{
  "manifest_version": 3,
  "name": "CSS Ref",
  "version": "1.0",
  "description": "Search and browse a comprehensive CSS feature database with live highlighting and category filters.",
  "permissions": [
    "activeTab",
    "storage"
  ],
  "sidebar_action": {
    "default_title": "CSS Ref",
    "default_panel": "sidebar.html"
  },
  "web_accessible_resources": [
    {
      "resources": [
        "features.json",
        "sidebar.css"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "css_ref@example.com",
      "strict_min_version": "109.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  }
}