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The Silverlight plugin lets you play audio and video in Firefox. Learn how to check if you have it installed and if not, how to install it.

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. {for fx42,win7,win8,win10} <!--Windows 64-bit Firefox requires Windows 7 or above (bug 1093741)--> {warning}'''Important:''' The new 64-bit version of Firefox for Windows does not recognize or support this plugin. See [https://blog.mozilla.org/futurereleases/2015/10/08/npapi-plugins-in-firefox/ this Mozilla blog post] for details.{/warning} {/for} __TOC__ = Checking for Silverlight = To determine whether you have the Silverlight plugin installed, visit Microsoft's [http://www.microsoft.com/silverlight/resources/install.aspx Get Microsoft Silverlight]. If Silverlight is installed, you will see a message with your Silverlight version. ;[[Image:Silverlight 5 installed]] = Installing Silverlight = {for win,mac} If you do not have Silverlight installed, follow the '''Installation Instructions''' on Microsoft's [http://www.microsoft.com/silverlight/resources/install.aspx Get Microsoft Silverlight]. {/for} {for linux} If you do not have Silverlight installed, follow the instructions at Go-Mono.com's [http://www.go-mono.com/moonlight/ Moonlight installation page]. Moonlight is an open source implementation of Microsoft Silverlight for Unix-like systems. {/for} = Uninstalling Silverlight = {for win,mac} To uninstall Silverlight, follow the '''Uninstall Silverlight''' instructions on Microsoft's [http://www.microsoft.com/getsilverlight/Get-Started/Install/Default.aspx Get Microsoft Silverlight]. {/for} {for linux} To uninstall a plugin, see [[Troubleshooting plugins#w_manually-uninstalling-a-plugin|Manually uninstalling a plugin]]. {/for} {for mac} = 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 [http://www.microsoft.com/silverlight/resources/install.aspx Get Microsoft Silverlight]. {for not fx23} In some cases, this may not resolve the problem and you will need to manually enable the Silverlight plugin: #[[T:Open Add-ons|type=Plugins]] # Find Silverlight in the list of plugins and click its {button Enable} button. {/for} {for fx23} In some cases, this may not resolve the problem and you will need to manually activate the Silverlight plugin: #[[T:Open Add-ons|type=Plugins]] # Find Silverlight in the list of plugins and select {button Always Activate} in its drop-down menu. {/for} {/for}