duplicate of [/questions/1206014] thread. I already attempt all possible solutions, like start a new profile, start firefox in safemode, uninstall/reboot/reinstall, etc... firefox insist to stay with one left over process in task manager after i close all browsers. Everytime I open firefox, it show 6 processes... after closing, one is always left. If I open Firefox again, close and you will have 2 left, and keep going up... Need some help to identify why and how to fix this.