Use the Silverlight plugin to play audio and video

Revision Information
  • Revision id: 8164
  • Created:
  • Creator: AliceWyman
  • Comment: bug 598406 workaround for Firefox 4 on Mac 10.6
  • Reviewed: Yes
  • Reviewed:
  • Reviewed by: Chris_Ilias
  • Is approved? Yes
  • Is current revision? No
  • Ready for localization: Yes
  • Readied for localization:
  • Readied for localization by: Chris_Ilias
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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.


Checking for Silverlight

To determine whether you have the Silverlight plugin installed, visit Microsoft.com's Silverlight installation page.

If Silverlight is installed, you will see a message with your Silverlight version, such as The version of Silverlight installed is: Silverlight 3.

Installing Silverlight

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

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 instructions on Microsoft's Silverlight Uninstall page.

To uninstall a plugin, see Manually uninstalling a plugin.

Troubleshooting

Silverlight does not work in Firefox 4

Starting in Firefox 4.0 Beta 7, Firefox will run as a 64-bit application on Mac OS 10.6 "Snow Leopard". Because of a bug, the 32-bit Silverlight plugin will fail to load and sites that depend on Silverlight (such as Netflix) will not work in Firefox 4 Beta 7 and above. As a workaround, you can run Firefox in 32-bit mode, as follows:

  1. From the menu bar, select Firefox and then select Quit Firefox
  2. Open the Applications folder in Finder and locate the Firefox application icon.
  3. Hold down the control key while you click the Firefox icon and select Get Info from the list of menu items.
  4. In the "Firefox Info" window, click the box in front of "Open in 32-bit mode" so that it is checked.
  5. Close the "Firefox Info" window and then restart Firefox 4.