Add slots to scroll QTabBar programmatically

I want create Firefox-like TabBar, but QTabWidget and QTabBar has no slots to scroll tabs programmatically without changing current tab.
I look at source (qtabbar.h) and found, that QTabBar class has private slot _q_scrollTabs where located needed functionality.

I suggest add two public slots:
scrollTabsLeft();
scrollTabsRight();
QTabBar's tool buttons connects to slots with clicked signals.