Convert to Hiero fails in Firefox 97

[banool]

Loving the framework and the detailed docs so far!

I'm not sure if this feature worked on previous versions of Firefox because I'm new to jsgam, but I noticed when following the tutorial that the Convert to Hiero feature doesn't work (nothing happens). In Chrome the feature still works fine, the box appears asking for you to enter a filename and then it saves, so this isn't an urgent issue. I'll try look in to it some time.