I decided to run some tests and some research after hearing your words.
But unfortunately, no matter what configs I checked or what browsers I used, there was no crash. T_T
I did find a memory leak in the desktop version, due to a Unity bug, but I'll fix that after the jam, unfortunately.
I'm really sorry, but I'm unlikely to be able to fix this. It looks like the issue is either with a specific browser version or a combination of plugins.