WPF

I have a .NET Winforms program that I want to run in a browser.  I don't need it to be a "web program" or anything, I just want it to run in a firefox tab instead of as a standalone.  Do I have to convert it to WPF or Silverlight or is there a simpler way?

/prog/ is for trolling and SICP herp derpery.  I suggest directing actual programming issues to stackoverflow.