Windows Media Player will not play embedded in Firefox

I'm puzzled over the sudden inability to play embedded Windows Media Player files in Firefox. Everything was working fine, then suddenly yesterday with no changes made by me and no updates or other changes to the system I am aware of, suddenly it will not play.
I can right click a link and save it, and it will play in the regular Media Player. However, when the content is embedded in a website, it loads the page and just sits there. Won't play.
I'm using:
Windows Vista Home Premium
Windows Media Player v. 11.0.6002.18311
Firefox 3.5.5
I went to this page:
http://forums.mozillazine.org/viewtopic.php?t=206213
And when I type in about:plugins, I cannot see the DRM files. Am I supposed to? I tried using the Windows Media Player Plugin for Firefox (wmpfirefoxplugin) to repair it, but that hasn't helped.
Any advice? Please keep in mind that I am practically retarded when it comes to tech stuff, and working several jobs and in school full time, so I really don't have the ability to spend hours and hours researching this. I need a concise, quick fix. Thanks!

Why are you using such an old Firefox/3.5.3 version from 2009 (Gecko/20090824) as shown in the user agent and haven't updated Firefox for such a long time?
See:
*https://support.mozilla.org/kb/Finding+your+Firefox+version
The Firefox 3.5.3 version that you currently run is no longer supported with security updates.
You should at least use the latest Firefox 3.6.x version if you do not want to switch to Firefox 4+ versions.
*https://support.mozilla.org/kb/Updating+Firefox
Your plugins list in the system details list shows the WMP plugin (np-mswmp), so that plugin should be working.
Do WMP test pages work?
*http://kb.mozillazine.org/Testing_plugins
See also:
*https://support.mozilla.org/kb/Managing+file+types

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