Group Tabs do not respond to color changes

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I am using Beta 005 with FF 35.

Nearly all color configuration has disappeared from the group tabs.  They are 
all black on gray, except the selected one is black on red.  My settings, now 
and in the past, have been white on blue for non-selected group tabs.  
Upgrading to FF 35 and Beta 005 has caused reversion of these to black on gray, 
as noted above, regardless of the settings.

This problem occurs, even after I have disabled Colorful Tabs and Tab Mix Plus 
and then restarted FF 35.

Original issue reported on code.google.com by [email protected] on 18 Feb 2015 at 8:55