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I have installed Windows Media Player Plug-In for Firefox but the test video doesn't work, how can I solve this problem?


The plu-in is definitely there and installed

Additional System Details

Installed Plug-ins

  • getplusplusadobe16290
  • Adobe PDF Plug-In For Firefox and Netscape "9.4.0"
  • Default Plug-in
  • BitTorrent Plugin 1
  • The QuickTime Plugin allows you to view a wide variety of multimedia content in Web pages. For more information, visit the QuickTime Web site.
  • Java(TM) Platform SE binary
  • np-mswmp
  • Office Plugin for Netscape Navigator
  • Shockwave Flash 10.0 r22
  • iTunes Detector Plug-in
  • Windows Presentation Foundation (WPF) plug-in for Mozilla browsers
  • RealJukebox Netscape Plugin
  • RealPlayer(tm) LiveConnect-Enabled Plug-In
  • Java Plug-in 1.6.0_11 for Netscape Navigator (DLL Helper)


  • User Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-GB; rv: Gecko/2009082707 Firefox/3.0.14 ( .NET CLR 3.5.30729)

More Information

It doesn't work when I try the test page

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  • Moderator
191 solutions 1967 answers

Helpful Reply

Your plugin list shows that the Firefox WPM plugin (np-mswmp) is installed. It's possible that the test page in the Play Windows Media files in Firefox with the Windows Media plugin article isn't working. (I can't tell since I'm using Mac OS X with the Flip4Mac plugin. The np-mswmp plugin is Windows-only.)

Try this other Windows Media Player plugin test page:

(You may have to wait a minute or so for the embedded content to load; then a brief "countdown" animation should display)

Modified by AliceWyman

Helper7677 165 solutions 1653 answers

Helpful Reply

Not related to your problem, but you might want to consider upgrading to a more current version of Firefox, unless you have a specific reason for using Firefox 3.0.x. The last version of the Firefox 3.0.x series (no longer supported or updated, even for security issues) was Firefox 3.0.19 which was released on 03/15/2010.

Read this carefully: http://support.mozilla.com/en-US/kb/Upgrading+to+Firefox+3.6

The current version is Firefox 3.6.11
Download Firefox 3.6.11: http://www.mozilla.com/en-US/firefox/all.html

Whether you upgrade your browser or not, you do have out-of-date plugins with known security issues. You should upgrade/update your plugins.

  • Shockwave Flash 10.0 r22
  • Java Plug-in 1.6.0_11 for Netscape Navigator (DLL Helper)
  1. Check your plugin versions: http://www.mozilla.com/en-US/plugincheck/
    • Note: plugin check page does not have information on all plugin versions
  2. Update Shockwave Flash
  3. Update Java: