February 28^th, 2009

"Microsoft's .Net Framework Assistant" is installed in your Firefox Browser without your consent as part of Microsoft's .Net framework. It's installed via Windows Update, so its installation can't be easily blocked. It can't be uninstalled (they made it intentionally very hard) and looking at Microsoft's track record, there's absolutely no reason to trust that it's secure. Also, it transfers information about software on your computer to third party servers, again without your consent.

That I think, fits the definition of spyware.

Fortunately, there's a way to uninstall it from your machine as long as you have administrative privileges. I found a good recipe here. Basically you have to edit the registry key

HKEY_LOCAL_MACHINE\SOFTWARE\Mozilla\Firefox\extensions

and delete the key named {20a82645-c095-46ed-80e3-08825760534b}. At which point, after a browser restart, the extension will be gone.

Unfortunately, Microsoft also takes the liberty to modify your preferences to add the .NET framwork's version to your browser's referrer. To fix this, type about:config into your browser's URL bar, then type "microsoft" into the search box, right-click on the key "general.useragent.extra.microsoftdotnet" and click "reset". That's it, you're done.