$(document).ready(function(){
    MacFontFix();
});
$(window).load(function(){
    MacFontFix();
});

function MacFontFix() {
    if (navigator.platform.match(/mac/i)) {
        $('h1, h2, h3, h4, h5, h6, p, a, li, dt, dd, span, td').css('opacity', '0.9999');
    }
}