Examine source code of SEO Tag Inspector

{
  "manifest_version": 2,
  "name": "SEO Tag Inspector",
  "description": "Inspect the metadata of any page in one place: raw values, length against the usual display limits, canonical and robots handling, plus previews of the search snippet and the social card built from those tags.",
  "version": "2.8.6.9",
  "browser_specific_settings": {
    "gecko": {
      "id": "{deb4e8dd-8c7d-4a11-9f6e-0e3d3cb76636}",
      "strict_min_version": "101.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "icons": {
    "32": "graphics/icon-32.png",
    "48": "graphics/icon-48.png",
    "64": "graphics/icon-64.png",
    "96": "graphics/icon-96.png",
    "128": "graphics/icon-128.png"
  },
  "browser_action": {
    "default_title": "SEO Tag Inspector",
    "default_popup": "popup.html",
    "default_icon": {
      "32": "graphics/icon-32.png",
      "48": "graphics/icon-48.png",
      "64": "graphics/icon-64.png"
    }
  },
  "permissions": [
    "activeTab",
    "storage"
  ]
}