Hello Ondra, Thank you for contacting National Instruments.
What version of LabVIEW are you running? To use the Run Time Engine (RTE) 7.0, you must be running LabVIEW 7.0. If you are running 6.1 or earlier, you must install the corresponding RTE. To view LabVIEW 6.1 front panels in Mozilla, further steps will be necessary. Please follow the link below for instructions. http://digital.ni.com/public.nsf/websearch/93D8AD6F55D6F91486256BE6006FB868?OpenDocument Let me know if this does not solve your problem. Sean C. Applications Engineer National Instruments
