I'm not sure why this is. I also use Firefox and the game runs fine, as is the case for many others. I'm not at all trying to blame you for anything, I'm just not sure how to approach this problem when it's so isolated.
AFAIK, this should be fixed in [this](https://github.com/godotengine/godot/pull/93143)
Okay, yeah. It's as I suspected. Going down the rabbit hole a bit here, it's fixed in beta3. The web version is using beta1. There was a bug that was preventing me from upgrading to beta3, but they've since pushed out a few release candidates so I may try those.
Thank you for looking into it! That helps a ton knowing it's not me doing something dumb on my end. I'll make a note to prioritize looking into this.