Examine source code of CaptionsEntry

{
  "manifest_version": 3,
  "name": "CaptionsEntry",
  "version": "1.0.0",
  "description": "Audit caption and media accessibility signals for video players on active pages.",
  "icons": {
    "48": "insignia/icon-48.png",
    "96": "insignia/icon-96.png",
    "128": "insignia/icon-128.png"
  },
  "action": {
    "default_title": "CaptionsEntry",
    "default_popup": "report/panel.html",
    "default_icon": {
      "48": "insignia/icon-48.png"
    }
  },
  "permissions": [
    "activeTab",
    "scripting",
    "tabs",
    "storage",
    "clipboardWrite"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{f0d1f9ec-d95a-40b4-a514-2bca5f93c198}",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}