Please note that the fixes in this mod have already been implemented into IR, version 2.0.5. If you've already updated to that or a later version, then you may safely remove this mod from your save.
The only reason to continue using this mod would be if you're unable to update to factorio version 1.1.14 (which is required by IR 2.0.5), perhaps due to another mod being incompatible.
This mod fixes what I suspect to be a small oversight with the crafting time of the glass ingot recipe when cast from molten glass. It reduces the crafting time from 12.8s to 0.8s, to match all other ingot casting recipes in IR2.
The mod also fixes an exploit that allows free glass production using arc furnaces and ingot foundries by adjusting the recipe cost of molten glass from 4 to 8 ingots.