How to set "focus" on firefox?
<p>I have js:</p>

<pre><code>$(document).on('focus', '.uiopis', function() {
    $(this).removeClass("textareaBlur").addClass("textareaFocus");  
}).on('blur', '.uiopis', function() {  
    $(this).removeClass("textareaFocus").addClass("textareaBlur");   
}); 
</code></pre>

<p>and html:</p>

<pre><code>&lt;div&gt;
    &lt;form&gt;
        &lt;textarea class="uiopis" id="os{{ us.id }}" name="os{{ us.id }}"&gt;{{ us }}&lt;/textarea&gt;
    &lt;/form&gt;
&lt;/div&gt;
</code></pre>

<p>but this not working on firefox, why?</p>
