To run web client on your Firefox browser you should install IE tab Addon for it and set it up for default rendering engine for www.luxriot.com\* website
IE tab addon can be found here.
Follow installation instructions and install it in your firefox. If everything is ok you should restart firefox and chec ksettings for this new addon:
There should be added “www.luxriot.com\*” website in filter list (note that this is not link, but link filter and it ends with *) :
After those steps you should be able to view WebClient using Firefox.