And yet it works for everyone else. The problem is you. Use a different browser, use a different machine, go play games somewhere else, whatever. Just stop telling game devs there's a problem when the problem is you.
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The game designer has confirmed it works in Firefox. If you're having a problem with hundreds of games that work for everyone else, the problem is not with the games. It's you.
Use Chrome, or stop using Linux, or go make games yourself. Just stop complaining constantly on every game page as if the entire world needs to cater to your exact whims.