Examine source code of TwExtract to CSV

{
  "name": "TwExtract to CSV",
  "version": "2.8.8",
  "description": "Export and download all tweets from a user to CSV/Excel for Twitter",
  "manifest_version": 2,
  "author": "XTCodeTech",
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "permissions": [
    "identity",
    "identity.email",
    "storage",
    "webRequest",
    "tabs",
    "https://*.twitter.com/*",
    "https://*.x.com/*",
    "https://api2.xtcodetech.com/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://*.twitter.com/*",
        "http://*.twitter.com/*",
        "https://*.x.com/*",
        "http://*.x.com/*"
      ],
      "js": [
        "js/bootstrap.min.js",
        "js/csvparse.js",
        "js/content.js"
      ],
      "css": [
        "css/bootstrap.min.css",
        "css/style.css"
      ],
      "run_at": "document_start"
    }
  ],
  "browser_action": {
    "default_title": "TwExtract",
    "default_popup": "/pages/popup.html",
    "default_icon": {
      "16": "/imgs/icon16.png",
      "32": "/imgs/icon32.png"
    }
  },
  "icons": {
    "16": "/imgs/icon16.png",
    "32": "/imgs/icon32.png",
    "48": "/imgs/icon48.png",
    "128": "/imgs/icon128.png"
  },
  "web_accessible_resources": [
    "css/bootstrap.min.css",
    "js/inject.js"
  ],
  "key": "MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAll+mb3pp8HRRfOQof8fmKCJ+nuHhDThH5VF0yTiSO+uLyi3zZjDpTNwXCHWNubl61ftc4bRnX3rN/xJxaOY9Ewe7n3G4Azl0BPq9+JgtOTEqn8kvVFbrbI9cMdc98fT6tW83xUCUpyQZM53u5neH1BRdpCI4YssxTWprIOo3FnpM7EZa6SUfNF7TGaUX3JyXeLenIM3618q/Ykm7Dtdpmdy7N+3Sxqo5U9u4xpUVIEsD5UMlLvFIN1zjrTswfWMkUa8fcVvDeWakFMtTs3Qbfu9YaLcfxcF4VUj/8ybc+3I5RJr+ICQI6uP+gaPaEFIAuLiW+gGL9HgW8Uo9ya7xyQIDAQAB",
  "oauth2": {
    "client_id": "237362110050-phsjfij16sa6ho31lfa3fp5muki4b4js.apps.googleusercontent.com",
    "scopes": [
      "https://www.googleapis.com/auth/userinfo.email",
      "https://www.googleapis.com/auth/userinfo.profile"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{b9a157cc-f1d9-4001-8800-b90ed3892aee}"
    }
  }
}