Media player updating
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If the Firefox installation directory cannot be located, the plugin file "np-mswmp.dll" will be placed in another location such as C:\PFiles\Plugins and you will need to copy it to your Firefox or Sea Monkey installation plugins folder.
To check for these files, type about:plugins into the location bar.
Another option is to move the "plugins" folder" inside the "browser" folder, located inside the Firefox installation directory.
For example, in current Firefox versions on 64-bit Windows, the plugin "np-mswmp.dll" will be detected if it is located in the C:\Program Files (x86)\Mozilla Firefox\browser\plugins folder. Alternately, you can create a new "plugins" folder inside the %APPDATA%\Mozilla folder (e.g., inside the C:\Documents and settings\App Data\Roaming\Mozilla folder on Windows 7 or Vista) and then copy "np-mswmp.dll" to the new "plugins" folder, so that all Mozilla applications can find it.
Windows 7 users can install the HTML5 Extension for Windows Media Player Firefox Plug-in, which adds an extension that allows playback of H.264-encoded videos and additionally installs the WMP plugin by creating a C:\Users\App Data\Roaming\Mozilla\plugins folder and placing the file "np-mswmp.dll" in that location.
Warning: This extension has been reported to cause excessive memory usage in Firefox 5 or above.
See the Testing plugins article other WMP plugin test pages.
The WMP plugin is not included in Windows 7/Vista  and may also be missing in other Windows systems.The plugin installer adds the file "np-mswmp.dll" to the Firefox installation directory "plugins" folder, typically C:\Program Files\Mozilla Firefox\plugins or, on 64-bit Windows, C:\Program Files (x86)\Mozilla Firefox\plugins.Since Firefox 4, the "plugins" folder does not exist by default but will be created as needed.Microsoft's Technet division has developed a new Windows Media Player Firefox Plugin (file name "np-mswmp.dll") for Windows XP and above.This new plugin can be installed to solve a missing plugin issue (see below) or to take advantage of its new features (e.g., scripting support) on systems that already include the standard WMP plugin.Keep in mind that some versions of Windows Media Player are not available for all operating systems. Follow the guided prompts on the installation wizard to complete the update.