Examine source code of Pomocník GIVT.cz

{
  "author": "Givt.cz",
  "background": {
    "scripts": [
      "/js/jquery-3.2.1.min.js",
      "/js/background.js"
    ]
  },
  "browser_action": {
    "default_icon": "images/icon16_gray.png"
  },
  "content_scripts": [
    {
      "css": [
        "/serp/style.css"
      ],
      "matches": [
        "*://www.google.cz/*",
        "*://www.google.com/*",
        "*://search.seznam.cz/*",
        "*://*.heureka.cz/*"
      ],
      "run_at": "document_start"
    }
  ],
  "description": "Rozšíření, díky kterému už nikdy při nakupování nezapomenete na GIVT.",
  "homepage_url": "https://givt.cz/",
  "icons": {
    "16": "images/icon16.png",
    "48": "images/icon48.png",
    "128": "images/icon128.png"
  },
  "manifest_version": 2,
  "name": "Pomocník GIVT.cz",
  "version": "3.5.5",
  "web_accessible_resources": [
    "toolbar/*",
    "js/jquery-ui-1.12.1/*"
  ],
  "permissions": [
    "webRequest",
    "storage",
    "http://*/*",
    "https://*/*",
    "activeTab",
    "tabs"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "@givt-toolbar-cz"
    }
  }
}