I'm not sure what iResFire is, but it's not fire resistance (or it's not the real fire resistance - it may be something else that's adding to the real fire resistance).
The "i" prefix suggests that it's a "magIc item". - you're looking for a generic ability - prefix "x" or an ability - prefix "ab". So I'll bet it's the Fire Resistance power that you can add to magic armor.
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