Quicktime Firefox Black Controls Firefox Quicktime Plugin Black Bar?

Firefox quicktime plugin black bar? - quicktime firefox black controls

During the playback of MP3 files in Firefox with the Quicktime plug-in, it works, but it looks like a black bar and can not control it ...
Windows 7 x 64 and the latest Firefox
I can repair or install a new extension, which can play MP3 files to me in Firefox?