Examine source code of Permission to Hack

{
  "manifest_version": 2,
  "name": "Permission to Hack",
  "description": "This extension crawls the security.txt of each website you visit. It informs you once if you are allowed to hack the site and shows the regardings policies.",
  "version": "1.0",
  "author": "Martin Renze",
  "homepage_url": "https://www.martin-renze.de/",
  "icons": {
    "48": "icons/hack38.png"
  },
  "browser_action": {
    "default_title": "Permission to Hack",
    "default_icon": {
      "19": "icons/doNotHack20.png",
      "20": "icons/doNotHack20.png",
      "38": "icons/doNotHack38.png"
    }
  },
  "background": {
    "scripts": [
      "permissionToHack.js"
    ]
  },
  "permissions": [
    "activeTab",
    "tabs",
    "<all_urls>"
  ]
}