Examine source code of МТС Cashback

{
  "manifest_version": 2,
  "name": "МТС Cashback",
  "version": "2.4.5",
  "autor": "mts.cashback.public",
  "browser_action": {
    "default_popup": "index.html",
    "default_title": "МТС Cashback"
  },
  "content_scripts": [
    {
      "matches": [
        "https://*/*",
        "http://*/*"
      ],
      "js": [
        "./dist/content_script.min.js"
      ],
      "run_at": "document_end"
    }
  ],
  "web_accessible_resources": [
    "content_script/index.html",
    "content_iframe.min.js",
    "static/fonts/mtssans/*"
  ],
  "background": {
    "scripts": [
      "./dist/background.min.js"
    ],
    "persistent": false
  },
  "permissions": [
    "cookies",
    "storage",
    "tabs",
    "http://*/*",
    "https://*/*"
  ],
  "icons": {
    "16": "static/images/not_possible@16.png",
    "32": "static/images/not_possible@32.png",
    "48": "static/images/not_possible@48.png",
    "128": "static/images/not_possible@128.png"
  }
}