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Here’s the procedure required to remove this garbage from Firefox:

   1. Open Registry Editor (type regedit in the Start menu Search box in Vista/Windows 7, or in XP’s Run window).

   2. Expand the branches to the following key:

   * On 32-bit systems: HKEY_LOCAL_MACHINE \ SOFTWARE \ Mozilla \ Firefox \ Extensions

   * On x64 systems: HKEY_LOCAL_MACHINE \ SOFTWARE \ Wow6432Node \ Mozilla \ Firefox \ Extensions

   3. Delete the value named {20a82645-c095-46ed-80e3-08825760534b} from the right pane.

   4. Close the Registry Editor when you’re done.

   5. Open a new Firefox window, and in the address bar, type about:config and press Enter.

   6. Type microsoftdotnet in the Filter field to quickly find the general.useragent.extra.microsoftdotnet setting.

   7. Right-click general.useragent.extra.microsoftdotnet and select Reset.

   8. Restart Firefox.

   9. Open Windows Explorer, and navigate to %SYSTEMDRIVE%\Windows\Microsoft.NET\Framework\v3.5\Windows Presentation Foundation.

  10. Delete the DotNetAssistantExtension folder entirely.

  11. Open the Add-ons window in Firefox to confirm that the Microsoft .NET Framework Assistant extension has been removed.