Examine source code of Quick Reply Meet

{
  "manifest_version": 2,
  "name": "Quick Reply Meet",
  "description": "__MSG_extensionDescription__",
  "version": "2.0.0",
  "icons": {
    "16": "icon/16.png",
    "32": "icon/32.png",
    "48": "icon/48.png",
    "128": "icon/128.png",
    "512": "icon/512.png"
  },
  "homepage_url": "https://quickreplymeet.enzon19.com",
  "default_locale": "en",
  "permissions": [
    "storage"
  ],
  "key": "MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAvpcwM3kmJAqf700yPwaHZ669LDZuXTGZfAzfJHEzAPNcPkVCsdn7jtB+G980WEKu/46mg3UlI1VpE1O0QFgO1lc37ZlIOCKNRRduJixaZEOaQ+kt1j60TZz9Z8PCYc0i/ofo7nwSPPS/i5mjQWv1TldTiSk5NUNkRUL5rByOb92q82oSxEVuWXafazcJX9SvgwBjL6V8CS//LTpArJ6hsXY6zFy9RpnOUxfTFhCH0o+vX6TemSlBKa7vWkpbeY2gQpQMgxMO2i4+4Myt4iqqRuZe/3k6o118GwsZ/e2FLChdImwckqKKxgHkNskPx9wMIXq0wRp9nEDk72o8QD3UAwIDAQAB",
  "browser_specific_settings": {
    "gecko": {
      "id": "qrm@bolhastudios.com",
      "strict_min_version": "58.0"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "Quick Reply Meet",
    "default_popup": "popup.html"
  },
  "options_ui": {
    "open_in_tab": true,
    "page": "options.html"
  },
  "content_scripts": [
    {
      "matches": [
        "https://meet.google.com/*"
      ],
      "css": [
        "content-scripts/content.css"
      ],
      "js": [
        "content-scripts/content.js"
      ]
    }
  ]
}