Examine source code of Reading List Pro

{
  "manifest_version": 3,
  "name": "Reading List Pro",
  "version": "1.0",
  "description": "A sophisticated \"read later\" tool that syncs articles across devices, categorizes content, and provides estimated reading times. It also offers offline reading capability.",
  "action": {
    "default_popup": "popup.html",
    "default_icon": "reading_list_pro.png"
  },
  "icons": {
    "128": "reading_list_pro.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "efrainlangerwrzw33@hotmail.com"
    }
  }
}