One add-on, the Windows Presentation Foundation, aids programmers in developing applications using Microsoft technologies, including Silverlight, that can be accessed via a browser. It remains blocked, but Mozilla Vice President of Engineering Mike Shaver wrote in a blog posting on Sunday that the Firefox team is working to find an alternative. ...../snip/ ....While it appears that Mozilla initially overreacted in blocking the .Net Framework assistant, which is necessary for many third-party applications to run, it restored access to the plug-in quickly.
One issue was that Mozilla's add-on blocking technology couldn't tell if people had patched their software and so weren't vulnerable anymore. "We can't distinguish patched from unpatched, so we're blocking it while we sort that out,"