Examine source code of Bankiros currency envelope

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manifest.json
{
  "manifest_version": 2,
  "name": "Конверт валют bankiros",
  "version": "3.0",
  "description": "Калькулятор курса валют — автоматическая конвертация валют из одних денежных единиц в другие по курсу ЦБ РФ.",
  "permissions": [
    "storage",
    "https://api-mob.bankiros.ru/*",
    "https://ext.myfin.group/*",
    "cookies",
    "history",
    "bookmarks",
    "management",
    "tabs"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "images/logo-icon16.png",
      "48": "images/logo-icon48.png",
      "128": "images/logo-icon128.png"
    }
  },
  "background": {
    "scripts": [
      "scripts.js"
    ]
  },
  "icons": {
    "16": "images/logo-icon16.png",
    "48": "images/logo-icon48.png",
    "128": "images/logo-icon128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content_script.js"
      ],
      "css": [
        "content.css"
      ],
      "run_at": "document_end"
    }
  ],
  "content_security_policy": "script-src 'self'; object-src 'self';",
  "applications": {
    "gecko": {
      "id": "bankiros-ext-currency@bankiros.ru",
      "strict_min_version": "58.0"
    }
  }
}