Firelord is a powerful herald of Galactus just like the rest but he does always seem to be taking a beating whenever the guy is on screen. His cosmic fire and super speed can overwhelm most opponents but it won’t be able to do a whole lot against Thor. Thor is strong enough to resist the attacks and fast enough to also overwhelm Firelord’s counter blows. His offense just isn’t at a high enough level where he could hope for a victory. Thor wins.