Examine source code of Property Track

{
  "name": "Property Track",
  "description": "Find a fair price for your next home.",
  "version": "1.5.0",
  "manifest_version": 2,
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "content_scripts": [
    {
      "js": [
        "content.js"
      ],
      "matches": [
        "https://www.rightmove.co.uk/*"
      ],
      "run_at": "document_end"
    }
  ],
  "browser_action": {
    "default_icon": {
      "16": "img/icon-16.png",
      "32": "img/icon-32.png",
      "48": "img/icon-48.png",
      "128": "img/icon-128.png"
    }
  },
  "icons": {
    "16": "img/icon-16.png",
    "32": "img/icon-32.png",
    "48": "img/icon-48.png",
    "128": "img/icon-128.png"
  },
  "web_accessible_resources": [
    "img/icon-16.png",
    "img/icon-32.png",
    "img/icon-48.png",
    "img/icon-128.png",
    "content.js",
    "background.js"
  ],
  "permissions": [
    "https://www.rightmove.co.uk/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{fe970a7a-9428-4baa-b5cd-3312b8b35377}"
    }
  }
}