Alterar as cores dos i´s de uma página

i.js

var letras = ['i', 'I', 'í', 'Í', 'ï', 'Ï'];
$('*').each(function(){
	var text = $(this).text();
	var html = $(this).html();

	if( html == text ){
		for( i in letras ){
			text = text.replace(letras[i], '<span style="color: orange !important; display: inline !important; margin: 0 !important; padding: 0 !important; border: none  !important; background: transparent !important;">' + letras[i] + '</span>');
			$(this).html(text);
		}
	}
});