Registry Entry Left

I don't know if this is a bug with FF or FFP, but I noticed a registry entry was left after closing FFP and letting it close completely. I downloaded and installed the most recent version (2.0.0.12) with no other extensions or themes installed. I did not change any options either. I can surf the internet normally with this clean version, close FF and nothing is left on the computer. But as soon as I visit gmail and close FFP, a registry entry is left at HKEY_LOCAL_MACHINE\SOFTWARE\mozilla.org

Again I don't know if this is a bug with FF or FFP. If there is a fix for this please let me know.