May 7, 2014 at 8:01 pm
#16291
Keymaster
Its unclear to me which is the issue; but, have you tried the Colorful Tabs' Options' Tweaks? One of them is 'Display Tab-Stack below the tabs' and you could also try 'Aggressive Mode'. The css code can be applied based on OS (and FF version), so there must be a difference causing it.