Firefox Portable cann't play music online ,Who can help me?

Firefox Portable cann't play music online ,Who can help me?

IF I import a reg file Like that:

============================================
Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\MediaPlayer]

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\MediaPlayer\ShimInclusionList]

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\MediaPlayer\ShimInclusionList\FIREFOX.EXE]
============================================

The Firefox Portable can play music online,but when I close the Firefox ,the reg file which I import cann't clean ,who can help me ? tell me how can I do ?thanks.