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Article ID: 963707 - Last Review: November 17, 2011 - Revision: 4.0

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INTRODUCTION

This article describes how to remove the .NET Framework Assistant for Firefox from your computer. This article also describes how to update the .NET Framework 3.5 SP1 for the .NET Framework Assistant 1.0 so that the component can be disabled.

Notes
  • If you have installed Firefox 3.6 or a later version and the .NET Framework Assistant 0.0.0 has appeared in your list of Firefox extensions, use Method 2 to remove the extension.
  • 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/downloads/details.aspx?FamilyID=cecc62dc-96a7-4657-af91-6383ba034eab (http://www.microsoft.com/downloads/details.aspx?FamilyID=cecc62dc-96a7-4657-af91-6383ba034eab)

MORE INFORMATION

In the .NET Framework 3.5 SP1, the .NET Framework Assistant enables Firefox to use the ClickOnce technology that is included in the .NET Framework. The .NET Framework Assistant is added at the computer level so that its functionality can be used by all users at the computer level instead of at the user level. As a result, the Uninstall button is unavailable in the Firefox Add-ons menu because standard users are not permitted to uninstall machine-level components.

To resolve this issue, use one of the following methods:

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/downloads/details.aspx?FamilyID=cecc62dc-96a7-4657-af91-6383ba034eab (http://www.microsoft.com/downloads/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\Extensions
        For 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}" /f
        For 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: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

REFERENCES

For information about ClickOnce deployment in supported browsers, see the "Deploying with ClickOnce using IE and Firefox" article on the following Microsoft Communities Web site:
http://windowsclient.net/wpf/wpf35/wpf-deploying-clickonce-ie-firefox.aspx (http://windowsclient.net/wpf/wpf35/wpf-deploying-clickonce-ie-firefox.aspx)
For information about the Windows Registry Extension method that the .NET Framework extension uses to register the .NET Framework Assistant with Firefox, view the "Adding Extensions Using the Windows Registry" article on the following Mozilla Web site:
https://developer.mozilla.org/en/Adding_Extensions_using_the_Windows_Registry (https://developer.mozilla.org/en/Adding_Extensions_using_the_Windows_Registry)
For information about how to uninstall Mozilla add-ons, view the "Uninstalling add-ons" article on the following Mozillazine Web site:
http://kb.mozillazine.org/Firefox_:_FAQs_:_Uninstall_Extensions (http://kb.mozillazine.org/Firefox_:_FAQs_:_Uninstall_Extensions)
For more information about the .NET Framework 3.5 Service Pack 1, visit the following Microsoft Web site:
http://www.microsoft.com/downloads/details.aspx?FamilyId=AB99342F-5D1A-413D-8319-81DA479AB0D7&displaylang=en (http://www.microsoft.com/downloads/details.aspx?FamilyId=AB99342F-5D1A-413D-8319-81DA479AB0D7&displaylang=en)

APPLIES TO
  • Microsoft .NET Framework 3.5 Service Pack 1
Keywords: 
kbhotfixserver kbexpertiseadvanced kbqfe kbsurveynew KB963707
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