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//facebook browser fix
var iOS = parseFloat(('' + (/CPU.*OS ([0-9_]{1,5})|(CPU like).*AppleWebKit.*Mobile/i.exec(navigator.userAgent) || [0,''])[1]).replace('undefined', '3_2').replace('_', '.').replace('_', '')) || false;
if ( iOS )
var userAgent = navigator.userAgent;
navigator.__defineGetter__('userAgent', function(){
if ( iOS )
return userAgent.replace( 'like Gecko) Mobile', 'like Gecko) Version/' + iOS + '.0 Mobile' ) // customized user agent
return userAgent;
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