$browserpagetitle= $this->item->extraFields->custompagetitle->value;
$document = JFactory::getDocument();
$document->setTitle($browserpagetitle);

// Use extrafields as meta data - thank you @heyjoecampbell and @kbrookes
$doc = JFactory::getDocument();
if ( isset( $this->item->extraFields->title_tag->value ) && ($this->item->extraFields->title_tag->value !=='') ) {
	$doc->addCustomTag('<title>'.$this->item->extraFields->title_tag->value.'</title>');
}
if ( isset( $this->item->extraFields->meta_description->value ) && ($this->item->extraFields->meta_description->value !=='') ) {
	$doc->addCustomTag('<meta name="description" content="'.$this->item->extraFields->meta_description->value.'" />');
}
// See also https://gist.github.com/kricore/2c9a5434748c5f5f6cf9
// Cleanup the extrafields content so you can use them as metatags
$safe 		= array("", "");
$nonsafe 	= array("'", "\"");
$custometa  = $this->item->extraFields->NAME->value;
$safemeta 	= str_replace( $nonsafe, $safe, $custometa);
echo $safemeta;