问题
Firefox depends on an extension and plugin installed by the .NET 3.5 installer to run XBAPs. Unfortunately, in Windows 7 the .NET 3.5 runtime is already installed.
Does anyone know how to get a hold of these plugins/extensions so you can actually deploy XBAPs to FireFox on Windows 7?
回答1:
Turn out, the answer is to copy the DLL of the extension out of another (presumably XP) machine that can run the .NET 3.5 runtime and deploy it.
I'm uncertain of the legality of this maneuver, but it works.
来源：https://stackoverflow.com/questions/1500940/xbap-with-firefox-and-windows-7