Hi!
Sounds very strange as browser type should not affect server response at all.
I’ve tried both browsers, but I got responses at almost equal speeds (~1 second)
Firefox:
https://i.imgur.com/fSRP11x.png
Chrome:
https://i.imgur.com/TbDmzDP.png
Are you sure it wasn’t just a temporary server outage or something with the browser cache, or maybe a browser plugin?