Examine source code of Admin Panel Finder

{
  "manifest_version": 2,
  "name": "Admin Panel Finder",
  "version": "1.0.0",
  "description": "Find admin panels by testing URLs with subdirectory extensions (only for pen-testing)",
  "author": "PANNIKOS",
  "icons": {
    "16": "icon16.png",
    "32": "icon32.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "permissions": [
    "http://*/*",
    "https://*/*",
    "storage"
  ],
  "browser_action": {
    "default_icon": {
      "16": "icon16.png",
      "32": "icon32.png",
      "48": "icon48.png",
      "128": "icon128.png"
    },
    "default_title": "Admin Panel Finder",
    "default_popup": "popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{51dbac63-6988-492f-bfa4-592b3bca8c52}"
    }
  }
}