Current Version Plugin Windows Presentation Foundation

Windows Presentation Foundation or WPF plugin was installed on many Windows computer as part of a Windows update by Microsoft. Mozilla blocked this plugin and disabled because plugin had a major security vulnerability that can be exploited by malicious websites update.
Block was removed two days later and this plugin does not run by default in Windows 7. Reinstallation of .NET Framework 3.5 SP1 is required to install this plugin and add support for XBAP applications. There is another way of enabling support for XBAP application by copying files from a working windows XP or Vista to Firefox plugin directory. Depending on the framework version, you can find these DLLs in these directories.

c:\Windows\Microsoft.NET\Framework\v3.5\WPF\NPWPF.dll – for v3.5 [SP1]
c:\Windows\Microsoft.NET\Framework\WPF\NPWPF.dll – for v4

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