This extension help you using GoogleChrome49 on legacy OS (XP, etc) to act like latest version.
By using fake UserAgent and inject Automatic Polyfill javascript Service powered by polyfill.io.

Current UA (google-65 windows-10):
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/65.0.3325.181 Safari/537.36


Refference:
https://chrome.google.com/webstore/detail/djflhoibgkdhkhhcedjiklpkjnoahfmg
https://polyfill.io/v2/docs/
https://developer.chrome.com/extensions/webRequest
https://developer.chrome.com/extensions/content_scripts
https://chromium.googlesource.com/chromium/src/+/master/chrome/common/extensions/docs/examples

https://stackoverflow.com/questions/16133614/chrome-extensions-that-runs-js-before-every-page-loads-using-content-script
https://stackoverflow.com/questions/11128296/chrome-content-script-to-access-and-modify-window
https://stackoverflow.com/questions/9515704/insert-code-into-the-page-context-using-a-content-script