It seems that Microsoft has secretly added an extension to our Firefox browser without user consent and it poses the same risk that IE has.
It allows third parties to install software without your permission.

Back around the end of January there was a Microsoft Windows Update (KB951847) that installed the SpyWare (done without user consent/knowledge and can not be removed easily) Microsoft .NET Framework Assistant 1.0 extension into Firefox.
Note: If you have not install Windows Update KB951847 OR not using Windows Update this extension will not be installed.

To remove the add-on following these directions:

1.In Firefox goto your tools>addons
then scroll through your addons
you will find Microsoft.NET Framework Assistant 1.0 extension added into Firefox. You will notice how the ‘Uninstall’ button is grayed out.
DO NOT DISABLE!!!

2. Close Firefox

3. In Windows Explorer go to this location:

C:\WINDOWS\Microsoft.NET\Framework\v3.5\Windows Presentation Foundation\DotNetAssistantExtension

4. This folder should contain 2 sub-folder and 2 files.

5. Delete everything in this folder, but leave the folder.

6. Restart Firefox and go to your add-ons list. The add-on should no longer be listed. if it is not gone, continue on with the below.

7. In the address bar type about:config

8. In the Filter field type general.useragent

9. Look for an entry called general.useragent.extra.microsoftdotnet

10. Right -click on the entry and select ‘reset’

Now close firefox and restart it again, check your addons it should be removed.

Now, for the most part these steps worked for me.
Good Luck.

thanks

I tend to keep my system and software up2date, however I do not have this extension listed. I hardly think this is that far reaching or maybe I am just lucky?