I am trying to browse a website, however, it only works under Windows and Mac because they use the navigator.platform from JavaScript to find out the architectu
navigator.platform
Attempting to change this property (at any time) in Firefox yields:
Error: setting a property that has only a getter Source File: index.html Line: 1
Error: setting a property that has only a getter
Source File: index.html
Line: 1
So I think you will have a hard time.
I'd try to contact the author about obtaining a fix.