nspluginviewer cannot load gecko-mediaplayer

Reproducible: Always

Steps to Reproduce:
  1. { konqueror 'file:///usr/share/sounds/alsa/test.wav'; }
Actual Results:  
  1. 
konqueror(7911) KonqFactory::createView: "nsplugin"  : X-KDE-BrowserView-AllowAsDefault is valid :  false
konqueror(7911)/kdecore (KLibrary) findLibraryInternal: plugins should not have a 'lib' prefix: "libnsplugin.so"
konqueror(7911)/nspluginviewer (part) PluginFactory::PluginFactory: PluginFactory::PluginFactory
konqueror(7911) NSPluginLoader::instance: NSPluginLoader::instance ->  1
konqueror(7911)/nspluginviewer (part) PluginPart::PluginPart: PluginPart::PluginPart
konqueror(7911) NSPluginLoader::instance: NSPluginLoader::instance ->  2
konqueror(7911) KonqViewManager::doSetActivePart: PluginPart(0x220c160) KUrl("")
konqueror(7911) KonqMainWindow::slotPartActivated: PluginPart(0x220c160) "nsplugin"
konqueror(7911) KonqMainWindow::slotPartActivated: New current view KonqView(0x2229590)
konqueror(7911)/kparts KParts::Part::~Part: deleting widget DolphinView(0x2264890) ""
konqueror(7911)/kdecore (KConfigSkeleton) KCoreConfigSkeleton::writeConfig:
konqueror(7911)/kdecore (KConfigSkeleton) KCoreConfigSkeleton::writeConfig:
konqueror(7911)/kdecore (KConfigSkeleton) KCoreConfigSkeleton::writeConfig:
konqueror(7911) KonqView::openUrl: url= KUrl("file:///usr/share/sounds/alsa/test.wav") locationBarURL= "/usr/share/sounds/alsa/test.wav"
konqueror(7911)/nspluginviewer (part) PluginPart::closeUrl: PluginPart::closeUrl
konqueror(7911)/nspluginviewer (part) PluginPart::openUrl: -> PluginPart::openUrl
konqueror(7911) NSPluginLoader::newInstance: -> NSPluginLoader::NewInstance( parent= 0x22af310 , url= "file:///usr/share/sounds/alsa/test.wav" , mime= "audio/x-wav" ,  () () )
konqueror(7911) NSPluginLoader::loadViewer: NSPluginLoader::loadViewer
konqueror(7911) NSPluginLoader::loadViewer: Running nspluginviewer
unnamed app(7914)/nspluginviewer (Qt/Xt) main: 2 - parseCommandLine
unnamed app(7914)/nspluginviewer (Qt/Xt) main: 3 - create KApplication
Fontconfig warning: "/etc/fonts/conf.d/56-user.conf", line 9: reading configurations from ~/.fonts.conf is deprecated.
nspluginviewer(7914)/nspluginviewer (Qt/Xt) main: 4 - create XtEvents and GlibEvents
nspluginviewer(7914)/nspluginviewer (Qt/Xt) main: 5 - dbus requestName
nspluginviewer(7914)/nspluginviewer (Qt/Xt) main: 6 - new NSPluginViewer
Connecting to deprecated signal QDBusConnectionInterface::serviceOwnerChanged(QString,QString,QString)
nspluginviewer(7914)/nspluginviewer (Qt/Xt) main: 7 - app.exec()
nspluginviewer(7914)/nspluginviewer (Qt/Xt) GlibEvents::process: Qt already providing Glib integration, dropping ours
konqueror(7911) NSPluginLoader::loadViewer: nspluginviewer startup took: 777 ms
konqueror(7911) NSPluginLoader::newInstance: -> ownID ":1.407"  viewer ID: "org.kde.nspluginviewer-7911"
konqueror(7911) NSPluginLoader::lookup: Looking up plugin for mimetype  "audio/x-wav" :  "/usr/lib64/browser-plugins/gecko-mediaplayer-wmp.so"
nspluginviewer(7914)/nspluginviewer (plugin) NSPluginViewer::newClass: NSPluginViewer::NewClass(  "/usr/lib64/browser-plugins/gecko-mediaplayer-wmp.so" )
nspluginviewer(7914)/nspluginviewer (plugin) NSPluginClass::NSPluginClass: Plugin library  "/usr/lib64/browser-plugins/gecko-mediaplayer-wmp.so"  loaded!
nspluginviewer(7914)/nspluginviewer (plugin) NSPluginClass::initialize: NSPluginClass::Initialize()
nspluginviewer(7914) NSPluginClass::initialize: results in  3
nspluginviewer(7914)/nspluginviewer (plugin): Can't create plugin class 

nspluginviewer(7914)/nspluginviewer (plugin) NSPluginClass::shutdown: NSPluginClass::shutdown error= true
konqueror(7911) NSPluginLoader::newInstance: Couldn't create plugin class
konqueror(7911)/nspluginviewer (part) PluginPart::openUrl: <- PluginPart::openUrl =  false


Expected Results:  
  1. Let the plug-in play the sound in Konqueror.

 Mozilla Firefox plays the sound all right.