Examine source code of swaga playinnowbot

{
  "manifest_version": 2,
  "version": "1.0.3",
  "name": "swaga playinnowbot",
  "description": "Extension for secure authorization of reSwaga users in Telegram (esenin extension for playingnowbot)",
  "icons": {
    "16": "src/images/logo16.png",
    "32": "src/images/logo32.png",
    "48": "src/images/logo48.png",
    "128": "src/images/logo128.png"
  },
  "permissions": [
    "tabs",
    "storage",
    "cookies",
    "https://soundcloud.com/*",
    "https://music.yandex.ru/*",
    "https://music.yandex.com/*",
    "https://music.yandex.by/*",
    "https://music.yandex.kz/*",
    "https://music.yandex.ua/*"
  ],
  "background": {
    "scripts": [
      "src/background.js"
    ],
    "persistent": false
  },
  "browser_action": {
    "default_popup": "src/popup/popup.html",
    "default_title": "swaga playinnow | Authorization"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "swagaplayinnowbot@qmrrchh.ru"
    }
  }
}