css - How to override focus background style for a div element in firefox? -


i have set tabindex of div element -1 allow focus. firefox highlights div element when gets focus gray background. how remove default behavior? 

*:focus {   -moz-appearance:none;   outline: none;   background-color: none;  }

has no effect.

the firefox version 38.3.

here screen clipping of rendering of elements: enter image description here

$( document ).ready(function(){  		  if(navigator.useragent.indexof('firefox') > -1){  				$('.mydiv').css('background-color','yellow');  		  }  	});
.mydiv{  		background-color : green;  	}
<script  	  src="https://code.jquery.com/jquery-3.2.1.min.js"></script>  	</script>  	<div class="mydiv">  		<h1>change background color in mozila</h1>  	</div>


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