Is there a service for load testing an application through the emulation of actions in a browser?

Question

Node.js

Greetings!
My colleagues and I are developing an instant messaging service for internal needs and wondered how to perform load testing?
Is there a service that can:
1) Log in to the application
2) Enter the room
3) Write messages of different lengths at a given interval
All this through a browser.
I know about loadimpact, but there seems to be no way to set sequences of actions in the UI, only scripts and API calls directly.
Ideally I'm looking for a platform that will allow 500+ copies of chromedriver to run.

Answer 1

https://en.wikipedia.org/wiki/Selenium

Answer 2

jmeter

Answer 3

Tsung