Firefox ignores option selected=“selected”

Question

If you change a dropdown and refresh the page, Firefox seems to ignore the selected attribute.

Answer 1

use .prop() instead of .attr()

This does not work in firefox.
  $( 'option[value="myVal"]' ).attr( 'selected', 'selected' );
use this one
  $( 'option[value="myVal"]' ).prop( 'selected', 'selected' );

In other way
  $( this ).prop( 'selected', 'selected' );