Examine source code of Mobilescan

{
  "manifest_version": 3,
  "name": "Mobilescan",
  "version": "1.29.3",
  "description": "Pełne informacje o ogłoszeniach samochodów osobowych i motocykli",
  "icons": {
    "128": "mobilescan-128.png"
  },
  "background": {
    "scripts": [
      "background/index.js"
    ],
    "type": "module"
  },
  "options_ui": {
    "page": "options/index.html",
    "open_in_tab": true
  },
  "web_accessible_resources": [
    {
      "resources": [
        "mobilescan-128.png"
      ],
      "matches": [
        "*://*.mobilescan.pl/*",
        "*://*.otomoto.pl/*",
        "*://*.olx.pl/*",
        "*://*.autoplac.pl/*"
      ]
    }
  ],
  "action": {
    "default_icon": "mobilescan-128.png",
    "default_title": "Mobilescan Extension",
    "default_popup": "popup/index.html"
  },
  "permissions": [
    "scripting",
    "storage",
    "tabs",
    "webRequest"
  ],
  "host_permissions": [
    "*://*.mobilescan.pl/*",
    "*://*.otomoto.pl/*",
    "*://*.olx.pl/*"
  ],
  "optional_host_permissions": [
    "*://*.autoplac.pl/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{39eb8cd5-3055-4e45-9ba0-1351404bae81}"
    }
  }
}