Examine source code of Sniffo.pl - produkty z dwoma rabatami

{
  "manifest_version": 2,
  "version": "1.2.6",
  "version_name": "1.2.6",
  "name": "Sniffo.pl - produkty z dwoma rabatami",
  "short_name": "Wtyczka Sniffo.pl",
  "description": "Tysiące świeżych promocji do -70% każdego dnia. A do tego… drugi rabat od Sniffo!",
  "homepage_url": "http://sniffo.pl",
  "permissions": [
    "tabs",
    "webNavigation",
    "contextMenus",
    "webRequest",
    "storage",
    "<all_urls>"
  ],
  "icons": {
    "16": "img/sniffo-16.png",
    "32": "img/sniffo-32.png",
    "48": "img/sniffo-48.png",
    "64": "img/sniffo-64.png",
    "72": "img/sniffo-72.png",
    "128": "img/sniffo-128.png"
  },
  "applications": {
    "gecko": {
      "id": "{b289b20f-66fe-4662-9797-f606abf8f6f6}",
      "strict_min_version": "42.0"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "css": [
        "sniffo.css"
      ],
      "js": [
        "lib/jquery-3.1.0.min.js",
        "ub-content.js"
      ],
      "run_at": "document_end"
    }
  ],
  "background": {
    "scripts": [
      "lib/jquery-3.1.0.min.js",
      "ub-background.js"
    ]
  },
  "browser_action": {
    "default_icon": "img/sniffo-64.png",
    "default_popup": "ub-popup.html",
    "default_title": "sniffo.pl",
    "browser_style": true
  },
  "web_accessible_resources": [
    "fonts/*",
    "img/*",
    "sniffo.css"
  ]
}