Reply To: tabindex and accessibility

I’m afraid no override is possible for this file. You could use a custom script to remove all tabindexes though – although I am not exactly sure if that resolves it:

add_action('wp_footer', 'wp_footer_asp_custom_remove_tabindex', 9999);
function wp_footer_asp_custom_remove_tabindex() {
	?>
	<script>
	(function($){
		$('*[tabindex]').removeAttr('tabindex');
		setTimeout(function(){
			$('*[tabindex]').removeAttr('tabindex');
		}, 1000);
	})(jQuery);
	</script>
	<?php
}