When you click on the Hamburger Menu Icon at the top right the Right Slider Menu slides out. Then click on the X in the upper right corner of the red slide out menu and only on Fire Fox, the left side of the web site does not go back to the correct place. There is a white gap showing.

It works correctly in Safari and Chrome.

Can you look into this please?

I updated Salient to v 8.0.16 and looked at it directly, not from the amended child them. It still had the same problem with firefox. I had to go back to the child them and the old build.

Your live demo seems to be different than my site. By trying to rule out plugins I discovered that Slider Revolution was the problem.

I wrote this script to make it work properly. I don't know exactly what is causing it so I put a band aid on it.

<script>
jQuery(document).ready(function($){
 if ( $.browser.mozilla) {
   //  alert( "This is moz!" );
   $( ".slide_out_area_close" ).click(function clarke() {
     setTimeout(function() {

       $('#rev_slider_9_3_wrapper').css({"left": "2px"});
     // alert( "Handler for .click() called." );
 });
  });
}
});
</script>