Examine source code of SEO Quick Look

{
  "manifest_version": 2,
  "name": "SEO Quick Look",
  "version": "1.0",
  "description": "Get a quick SEO overview of the current webpage.",
  "icons": {
    "48": "icons/seo-icon-48.png"
  },
  "permissions": [
    "activeTab"
  ],
  "browser_action": {
    "default_icon": "icons/seo-icon-48.png",
    "default_popup": "popup.html",
    "default_title": "SEO Quick Look"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{467cd59f-e14b-4685-86fb-19df80e8c9be}"
    }
  }
}