Examine source code of My Seo Pro

{
  "manifest_version": 2,
  "name": "My Seo Pro",
  "version": "1.3",
  "description": "SEO support tool: check Domain Authority, Page Authority, Backlinks, and other SEO metrics from the Moz API.",
  "permissions": [
    "activeTab",
    "https://api.moz.com/*",
    "storage"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "32": "icons/logo_32.png",
      "64": "icons/logo_64.png",
      "128": "icons/logo_128.png"
    }
  },
  "icons": {
    "32": "icons/logo_32.png",
    "64": "icons/logo_64.png",
    "128": "icons/logo_128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://www.google.com/*",
        "*://www.bing.com/*",
        "*://www.yelp.com/*"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{c4e4ad7f-c74b-4c50-b43f-5ed703a97811}"
    }
  }
}