"Reply to super villain: I use Firefox in the latest synaptic release--I think it's 16.0.1. I have not idea what dictionary it uses, nor do I know how to find out.
I assume it is for US English. Anyway, the little wavy red lines do not appear in this post or my previous reply--that may have been some sort of glitch."
if you saw the red lines and you didn't wrote anything, then it was a glitch, the correction only happens when you are writing something
when you are typing on the forum, when you are posting or replying select the word that is marked as red and right click, mark check spelling and select a dictionary from the list, if there is none, add one