I've added the following code to html_output.php in 'function zen_href_link' to fix the security warning issue with firefox etc. Just thought I would post it here for anyone else. Feedback/criticism/suggestions greatly appreciated!

Code:
function zen_href_link($page = '', $parameters = '', $connection = 'NONSSL', $add_session_id = true, $search_engine_safe = true, $static = false, $use_dir_ws_catalog = true) {
    global $request_type, $session_started, $http_domain, $https_domain;

if($connection=='NONSSL' && $request_type=='SSL')
{
			
	if( $page == FILENAME_ADVANCED_SEARCH_RESULT
	|| $page == FILENAME_ADVANCED_SEARCH
	|| $page == FILENAME_DEFAULT
	|| $page == FILENAME_SHOPPING_CART)
	{
		$connection = $request_type;
	}
}

..rest of function is unchanged...
-Fold