Examine source code of Home Button Extension

{
  "manifest_version": 2,
  "name": "Home Button Extension",
  "version": "1.0",
  "description": "This extension provides home button icon , to click on this to redirect on specific URL.",
  "permissions": [
    "activeTab"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://www.uppclonline.com/*",
        "https://kescocp.eeslsmartmeter.in/*",
        "https://jhatpat.uppcl.org/*",
        "https://niveshmitra.up.nic.in/*",
        "https://appsavy.com/*",
        "https://consumer.uppcl.org/*",
        "https://www.kesco.co.in/*",
        "https://kesco.co.in/*"
      ],
      "css": [
        "content.css"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{5fb3304c-56f3-468d-976d-36b7369a7f20}"
    }
  }
}