Examine source code of MozBar SEO Toolbar

{
  "manifest_version": 2,
  "name": "MozBar - SEO Toolbar",
  "version": "1.3",
  "description": "MozBar provides instant SEO insights about websites and search engine result pages (SERPs).",
  "permissions": [
    "activeTab",
    "storage",
    "tabs",
    "http://*/",
    "https://*/"
  ],
  "icons": {
    "32": "icons/logo_32.png",
    "64": "icons/logo_64.png",
    "128": "icons/logo_128.png"
  },
  "browser_action": {
    "default_icon": "icons/logo_64.png",
    "default_popup": "popup.html",
    "default_title": "MozBar SEO Insights"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{5b4f1d28-6d47-4418-a485-81454af8afa5}"
    }
  }
}