ClickOnce fails with Firefox and other alternative browsers

As you might know Click Once does not support Firefox, to be more specific ClickOnce even requires IE to be your default browser to work 100%.
There are a few workarounds available:

• use IE for installing the Click Once application.
  This sounds a bit odd, but is probably is the easiest solution. If Firefox is your default browser you might still be able to install a click once app by using IE.
  The problem: If your Application carries a bootstrapper along with it to install prerequisites before the actual ClickOnce install, then it might not work.
  Workaround here: http://channel9.msdn.com/ShowPost.aspx?PostID=138879
• Install a FireFox Plugin to support ClickOnce
  You find one here: http://www.softwarepunk.com/cohelper/
  The problem is: solution does not work for Online ClickOnce Apps.
• Use ClickOnce Shortcuts
  If you install an click once application ( with offline availibility ) you find a shortcut in your Startmenu. The shortcut contains all information neccessary to launch or install the application. Put such a shortcut on you server (e.g with the text “Firefox users click here) and once the users clicks it in Firefox the Open/Save dialog appears. If the users has downloaded shortcut to his local machine and run it, Click Ocne will be invoked and the app will be installed.
  The problem: solution does not work for Online ClickOnce Apps

 You find more details over at Saurabh Pant’s blog .