Last February, Microsoft released a .NET 3.5 service pack via Windows Update. Part of the install process silently adds a Firefox extension allowing the browser to use the .NET ClickOnce feature. (The extension is named “Microsoft .NET Framework Assistant”.) There are some security concerns about this extension, and additionally, you can’t uninstall it without making a registry change. Needless to say, this irritated a good number of people. The uproar was so bad that Microsoft issued a patch allowing you to uninstall the extension normally.