How to remove the .NET Framework Assistant for Firefox

1. Delete the registry key for the extension.
   • Use Registry Editor:
     1. Log on with an account that has Administrator permissions.
     2. Click Start, click Run, type regedit, and then press ENTER.
     3. Locate and then click the following registry subkey.
        For x86-based computers:
        HKEY_LOCAL_MACHINE\SOFTWARE\Mozilla\Firefox\Extensions
        For x64-based computers:
        HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Mozilla\Firefox\Extensions
     4. Delete the {20a82645-c095-46ed-80e3-08825760534b} subkey.
2. In the Firefox user agent, reset the changes that you made in step 1. To do this, follow these steps:
   1. Start Firefox, type about:config in the Firefox address bar.
   2. Scroll down or use Filter to find the following preference item:
      general.useragent.extra.microsoftdotnet
   3. Right-click this item, and then click Reset.
   4. Restart Firefox
3. Remove the .NET Framework extension files. To do this, follow these steps:
   1. Log on with an account that has Administrator permissions.
   2. Click Start, click Run, type explorer, and then press ENTER.
   3. Open the following folder:
      %SYSTEMDRIVE%\Windows\Microsoft.NET\Framework\v3.5\Windows Presentation Foundation\DotNetAssistantExtension\
   4. Delete the DotNetAssistantExtension folder and all its contents