Now that I have the update of Firefox that checks every word I type with a CURSED American spell-checker, I have started getting confused about even the most simple of words even in day to day life. The differences between English and American English are so subtle it is often hard for my mind to pick out which is the right spelling at a glance. For instance is "Argument" "ArguEment" in British-English?

This is not helpful days before going into an honours course of Psychology.

P.S. "Honours" came out red-lined