Need to Replace Theme Font and Size Changer

[ellfeld]

Was using the above named addon to change size of menu and title bars. This was a legacy addon which doesn't work in Quantum.
How do I change the fonts size on the menu/title bars without this addon.

Thanks

[DanRaisch]

Duplicate, locking. Continue in http://forums.mozillazine.org/viewtopic ... #p14775689