Forum spell checker in Firefox.
It seems that I am not bright enough to use the spell checker. If you hit "start your discussion" instead of "resume editing" after checking the spelling, the change does not take. As a result I got my (Mr.) Period for my misspelling of the word "Mandarin."
Here's an example where I use the spell checker on the word below, make the change but don't hit resume editing:
Pneis
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