Hello,
I know this is counter-intuitive, but have you tried an older version of chrome or firefox? That's what most people are doing that run the game on a browser, at as far as I'm aware.
Thanks!

Alright, it took me a while, but I found a player that uses a mac and asked them about it. This was their response.
"I use safari and it works fine. It does not run nearly as smoothly as even chrome and has trouble connecting to 3v3, not sure why."
So apparently base Safari can run the game without issues.