No matter where you are online, if you are typing something, it spell checks it for you. All words it believes to be misspelled are faintly underlined in red. This is a dream for spelling and typing deficient people like myself.
Thank you Firefox for knowing how truly dumb I can be. Bless you.
–Jane, whose husband wonders how someone who reads so much can misspell so many things (pure talent is my only answer)