Use the Silverlight plugin to play audio and video

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  • Revision id: 105658
  • Created:
  • Creator: AliceWyman
  • Comment: 64-bit incompatibility warning {for fx42, win7,win8,win10} (see discussion)
  • Reviewed: No
  • Ready for localization: No
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Microsoft Silverlight is a plugin used by some websites to display multimedia content. This article describes how to check whether you have Silverlight installed, and if not, how to install it.

Important: The Windows 64-bit version of Firefox does not currently recognize or support this plugin.

Checking for Silverlight

To determine whether you have the Silverlight plugin installed, visit Microsoft's Get Microsoft Silverlight. If Silverlight is installed, you will see a message with your Silverlight version.

Silverlight 5 installed

Installing Silverlight

If you do not have Silverlight installed, follow the Installation Instructions on Microsoft's Get Microsoft Silverlight.

If you do not have Silverlight installed, follow the instructions at Go-Mono.com's Moonlight installation page. Moonlight is an open source implementation of Microsoft Silverlight for Unix-like systems.

Uninstalling Silverlight

To uninstall Silverlight, follow the Uninstall Silverlight instructions on Microsoft's Get Microsoft Silverlight.

To uninstall a plugin, see Manually uninstalling a plugin.

Silverlight is installed but does not work

Mozilla blocks older versions of Silverlight, causing sites like Netflix to display a message asking you to install Silverlight. To fix this, please update your installation of Silverlight to the latest version using Microsoft's Get Microsoft Silverlight.

In some cases, this may not resolve the problem and you will need to manually enable the Silverlight plugin:

  1. Click the menu button Fx89menuButton, click Add-ons and themesExtensions and themes and select Plugins.
  2. Find Silverlight in the list of plugins and click its Enable button.

In some cases, this may not resolve the problem and you will need to manually activate the Silverlight plugin:

  1. Click the menu button Fx89menuButton, click Add-ons and themesExtensions and themes and select Plugins.
  2. Find Silverlight in the list of plugins and select Always Activate in its drop-down menu.