Dirty Browser Enumeration Tricks – Using Chrome:// to Identify Firefox Plugins

&lt;img src=&quot;about:logo&quot; onload=&quot;alert(&#x27;Browser is Firefox!&#x27;)&quot; &#x2F;&gt;<p>Maybe this too?<p>&lt;img src=&quot;about:logo&quot; onerror=&quot;alert(&#x27;Browser is NOT Firefox!&#x27;)&quot; &#x2F;&gt;