Hypothermia, etc., à la Frostfall, perhaps?
Seems unlikely, but that's what first comes to mind with this name. Or perhaps it's related to the book, http://www.uesp.net/wiki/Skyrim:2920,_Hearth_Fire,_v9
Bethesda hasn't confirmed Hearthfire yet so it may not even be a future dlc. The screenshot which mentioned Hearthfire could have been made on microsoft word VERY easily.
I'm not familiar with any screenshot, but it was reported that Bethesda filed a http://tarr.uspto.gov/servlet/tarr?regser=serial&entry=85634522 for use of this term in connection with the class of products including "downloadable computer game software offered via the internet and wireless devices"