http://musicbee.niblseed.com/V2_4/MusicBee_Exe_Patched.zipi've also added some overrides for the Add Tab button
<element id="TabsBar.TabAddButton.Default" bg="230,220,210" fg="90,30,30" bdr="0,0,190" />
<element id="TabsBar.TabInCaptionBarAddButton.Default" bg="20,20,210" fg="90,230,30" bdr="230,10,190" />
for when the tool buttons are configured to display as a separate row and the tabs are below the toolbar
<element id="TabsBarBelow.TabAddButton.Default" bg="20,220,20" fg="190,30,9" bdr="220,0,0" />