Examine source code of Radar Cen

{
  "manifest_version": 3,
  "name": "Radar Cen",
  "version": "0.1.0",
  "description": "Displays historical price data on Ceneo.pl product listings.",
  "author": "Wiktor Dudek",
  "icons": {
    "16": "icons/icon-16.png",
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "@radar-cen",
      "strict_min_version": "147.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "action": {
    "default_icon": {
      "48": "icons/icon-48.png"
    },
    "default_popup": "popup/popup.html",
    "default_title": "Radar Cen"
  },
  "background": {
    "scripts": [
      "background/background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.ceneo.pl/*"
      ],
      "js": [
        "content/cache.js",
        "content/renderer.js",
        "content/queue.js",
        "content/content.js",
        "content/logger.js"
      ],
      "css": [
        "content/content.css"
      ],
      "run_at": "document_idle"
    }
  ],
  "permissions": [
    "storage",
    "tabs",
    "scripting"
  ],
  "host_permissions": [
    "https://www.ceneo.pl/*"
  ]
}