Examine source code of SEO SEO

{
  "manifest_version": 2,
  "name": "SEO SEO",
  "version": "1.0",
  "description": "Zeigt Titel, Beschreibung, Canonical und Index/Noindex einer Webseite an",
  "permissions": [
    "activeTab",
    "tabs"
  ],
  "browser_action": {
    "default_icon": "icon.png",
    "default_popup": "popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "contentScript.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{016df3df-9fcd-4270-901b-2b302224db1c}"
    }
  }
}