html version for Firefox available

Thanks to some other comments from the Godot Game Jam, I found out that the html export for Godot works for Firefox, but seems to have issue with Chrome.  If anyone tried with IE or Safari and it works, let me know.  I'm curious but don't have those browser available right now.

The sound is a bit delayed in the browser as well.  But at least it's easier to evaluate for the game jam.

Thanks!!