Examine source code of HackSearch Pro

{
  "name": "HackSearch Pro",
  "description": "Search in some of the ways hackers would to gather google indexed data about your website so that you can secure it yourself.",
  "homepage_url": "https://rejahrehim.com/hacksearch-pro",
  "developer": {
    "name": "Rejah Rehim",
    "url": "https://rejahrehim.com"
  },
  "manifest_version": 2,
  "permissions": [
    "tabs",
    "contextMenus"
  ],
  "icons": {
    "16": "hacksearch16.png",
    "32": "hacksearch32.png",
    "64": "hacksearch64.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "version": "2.1resigned1",
  "applications": {
    "gecko": {
      "strict_min_version": "57.0a1",
      "id": "{37a13bea-727f-4ceb-af9f-1fcfd61c2976}"
    }
  }
}