Plugin for Windows Media Player is not working with Firefox 4 on Windows 7

I updated my Firefox to the latest version 4 yesterday, but since this time seems plugin for Windows Media Player not working anymore. When I visit some website with embedded video - like [http://www.ta3.com/sk/live this] - the window with WMP is not displayed and no video is playing. The website reports: You don´t have any plugin for playing of this video.
I reinstalled the plugin for WMP several times - with no success. This problem is on all webpages with embedded video for WMP. The installation of WMP plugin is successfully finished, but no video is playing. I checked the “plugins“ folder in the installation directory of Firefox and everything seems to be OK. Where is also the problem? Please, help me with solving of this problem...
My operating system: Windows 7 (64-bit)

I just saw this posted to the mozilla.support.firefox newsgroup in the topic,<br>
[http://groups.google.com/group/mozilla.support.firefox/browse_thread/thread/f381fb349c4d109d/69bef0011240e600?hl=en&ie=UTF-8&oe=utf-8 Windows Media Player will not install in Firefox 4] <br>
''Just for the record, the extension that conflicted with Windows Media Player is named: Real Player Browser Record Plug-In 14.0.2''
<br>..... so try [[Troubleshooting extensions and themes]] to see if a Firefox extension is conflicting with the WMP Firefox plugin.

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