Examine source code of Vukajlija

{
  "manifest_version": 3,
  "browser_specific_settings": {
    "gecko": {
      "id": "vukajlija@igor.jerosimic",
      "strict_min_version": "138.0"
    }
  },
  "offline_enabled": false,
  "incognito": "not_allowed",
  "name": "Vukajlija",
  "short_name": "Vukajlija",
  "version": "5.0.2",
  "description": "Prikazuje poslednje dodate i odabrane definicija sa Vukajlije, omogućava izmenu pozadine na sajtu.",
  "homepage_url": "https://www.igorware.com/extensions/vukajlija?referrer-ver=firefox-ext-manager",
  "developer": {
    "name": "Igor Jerosimić",
    "url": "https://www.igorware.com/extensions/vukajlija"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "type": "module"
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "icons": {
    "16": "images/icon_016.png",
    "19": "images/icon_019.png",
    "32": "images/icon_032.png",
    "38": "images/icon_038.png",
    "48": "images/icon_048.png",
    "64": "images/icon_064.png",
    "128": "images/icon_128.png"
  },
  "action": {
    "default_title": "Vukajlija",
    "default_popup": "popup.html",
    "default_icon": {
      "16": "images/icon_016.png",
      "19": "images/icon_019.png",
      "32": "images/icon_032.png",
      "38": "images/icon_038.png"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "https://*.vukajlija.com/*"
      ],
      "js": [
        "includes/content.js"
      ],
      "run_at": "document_start",
      "all_frames": false
    }
  ],
  "content_security_policy": {
    "extension_pages": "default-src 'self'; connect-src https://api.igorware.com; font-src 'none'; img-src 'self'; media-src 'none'; object-src 'none'; style-src 'unsafe-inline'",
    "sandbox": "sandbox; default-src 'none';"
  },
  "permissions": [
    "alarms",
    "storage"
  ],
  "host_permissions": [
    "https://api.igorware.com/*"
  ]
}