Examine source code of SEO Meta Inspector

{
  "manifest_version": 2,
  "name": "SEO Meta Inspector",
  "version": "1.0",
  "description": "Inspect meta tags critical for SEO on the current page.",
  "icons": {
    "48": "icons/meta-inspector-icon-48.png"
  },
  "permissions": [
    "activeTab"
  ],
  "browser_action": {
    "default_icon": "icons/meta-inspector-icon-48.png",
    "default_popup": "popup.html",
    "default_title": "SEO Meta Inspector"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{774bcc48-fe7d-478f-9382-6545bf1c7dfe}"
    }
  }
}