500 page: distract users with cat puzzle

Doesn&#x27;t work in Firefox thanks to this amazing browser detection:<p><pre><code> Utils.prototype.setPlatform = function() { [&quot;Safari&quot;, &quot;Chrome&quot;, &quot;Android&quot;, &quot;iPhone&quot;, &quot;Blackberry&quot;].forEach(function(browser) { if (navigator.userAgent.indexOf(browser) &gt; -1) { browser = browser.toLowerCase(); if (browser === &quot;safari&quot; || browser === &quot;chrome&quot;) { platform = &quot;desktop&quot;; } else { platform = browser.toLowerCase(); } } }); document.body.setAttribute(&quot;data-platform&quot;, platform); return platform; };</code></pre>