Starting this game in a Vivaldi Browser just crashed my whole browser, lol (Chromium-based)
Edit: closing the tab while the game is running (after the start button) repeatedly crashes the browser. :'D
I didn't expect you to be able to fix this, especially since it seems to be a problem way out of your control if it crashes the whole browser.
It's very fair not to know about the Vivaldi browser, but since it's based on Chromium I just tried it in a clean (w/o plugins) version of Chrome and could reproduce it there! I guess this is just yet another thing to watch out for when releasing Godot games in the web, FYI. :'D