Examine source code of Rozmiary w Panelu

{
  "manifest_version": 2,
  "name": "Militaria Łódź Rozmiary w Panelu",
  "version": "1.0",
  "description": "Aplikacja do wyświetlania rozmiarów w panelu idosell na zakładce zamówienia.",
  "permissions": [
    "activeTab",
    "tabs",
    "storage",
    "<all_urls>"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://militarialodz.pl/*"
      ],
      "run_at": "document_start",
      "js": [
        "inject.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "images/icon16.png",
      "48": "images/icon48.png",
      "128": "images/icon128.png"
    }
  },
  "icons": {
    "16": "images/icon16.png",
    "48": "images/icon48.png",
    "128": "images/icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "militaria-addon@twojemail.com",
      "strict_min_version": "91.0"
    }
  }
}