Does fire penetration support gem help righteous fire?

if you want to penetrate something, you must hit it first

DoTs dont hit

e: fire, elemental, burning, AoE, DoT and general (Redbeak) damage modifiers work with RF

"

But the quality should in fact work right? since it's %fire increase.

right

e2: monster fire resist(which can be ofc negative) and damage taken modifiers (like shock, vulnerability and some unique mods) affect RF too of course, but they are completely separate mechanics