the customers cannot klick on any button, when they are in a ticket. I get the following JavaScript error:
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Blocked script execution in 'https://websupport.dimetis.de/otrs/customer.pl? customer.pl:1otrs/customer.pl?Action=CustomerTicketAttachment;Subaction=HTMLView;ArticleID=7909;FileID=1;OTRSCustomerInterface=OlHZ0L3pQRnOPpGe0hTAuoufzZYyAFE8' because the document's frame is sandboxed and the 'allow-scripts' permission is not set.