How to remove the .NET Framework Assistant for Firefox

Method 1: Download the Update to .NET Framework 3.5 SP1 for the .NET Framework Assistant 1.0 for Firefox

This update installs the .NET Framework Assistant on a per-user basis. As a result, the Uninstall button will be functional in the Firefox Add-ons menu.

Note This update is included in Windows 7 and in the .NET Framework 4.0.

To download the Update to .NET Framework 3.5 SP1 for the .NET Framework Assistant 1.0 for Firefox, visit the following Microsoft Web site:

http://www.microsoft.com/download/details.aspx?FamilyID=cecc62dc-96a7-4657-af91-6383ba034eab

Method 2: Remove the .NET Framework Assistant for Firefox

To remove the .NET Framework Assistant for Firefox from your computer, follow these steps:

1. Delete the registry key for the extension. To do this, use one of the following methods.

   • 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\ExtensionsFor x64-based computers:

        HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Mozilla\Firefox\Extensions

     4. Delete the {20a82645-c095-46ed-80e3-08825760534b} subkey.

   • Use a command prompt:

     1. Log on with an account that has Administrator permissions.

     2. Click Start, click Run, type cmd, and then press ENTER.

     3. At the command prompt, type the appropriate command, and then press ENTER.
        
        For x86-based computers:

        reg DELETE "HKLM\SOFTWARE\Mozilla\Firefox\Extensions" /v "{20a82645-c095-46ed-80e3-08825760534b}" /fFor x64-based computers:

        reg DELETE "HKLM\SOFTWARE\Wow6432Node\Mozilla\Firefox\Extensions" /v "{20a82645-c095-46ed-80e3-08825760534b}" /f

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:configin 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