There needs to be an auto equip button for quest equipment BADLY. It's tiring and tedious to un-equip and re-equip equipment every time you think you have something better.
WebGL is still an experimental technology by Unity and you will experience this crash on this version. The only workaround for this is to refresh your page.
You can always try playing on a different Internet browser such as Internet Explorer, Firefox, Safari, and Opera. Chrome will always use WebGL. If any of this Internet browser loads up WebGL, then that means you'll need to install Unity as it will use WebGL as an alternative if Unity is not installed.
If you already have both Firefox or the other Internet browser recommended and Unity Web Player installed, try the following:
Reinstalling Mozilla Firefox
Reinstalling Unity Web Player
Clearing your Unity cache
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 "Shop Heroes"){kind=icon}
We'll let the team know about your feedback. Thank you for helping Shop Heroes better!