how do I delete a Facebook screen name from container on Firefox. we had company and they logged into their Facebook, now I want to delete their Facebook name from drop down list, there should have been a "right click delete option to that list, now when I go to click on the Facebook Icon on the Firefox screen my visiting friends from out of state is there and it is unnecessary , as we gathered for a funeral and they shall not be returning for over a year. If there is no way to clear there Facebook screen name, please instruct me as to how I can delete face book from Firefox and I shall delete Facebook from Fire fox altogether and log in on my cell phone. Thank you for you time.