With the just released, so-called high priority, .NET Framework 3.5 SP1 'Family Update', Microsoft silently slipped an Extension into your Firefox. No where in the documentation, is this extension mentioned, it seems, and uninstall is disabled in the Add-ons Manger. (Thanks Microsoft!)

This add-on is said to provide click-once support for Firefox and also will report back to whatever web server is asking the latest version of .NET that you're using, and who knows what else?

The extension is "Microsoft .NET Framework Assistant 1.0"

Click to view attachment

Here's how to get rid of it:
a) a registry edit:
http://wyday.com/blog/2008/how-to-uninstal...t-from-firefox/

b) in the Address bar type: about:config - then filter to general.useragent.extra.microsoftdotnet and right click - reset.
- Restart Firefox and it is gone.

c) ( The .net extension does not reside in the profile/extensions folder as extensions do normally.)
Open Windows Explorer and go to \WINDOWS\Microsoft.NET\Framework\v3.5\Windows Presentation Foundation\DotNetAssistantExtension\ to remove the last remnants.


Done!