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Do you have the correct dictionary enabled? Go to Tools - Content - Choose your preferred language for displaying pages ...you may need to install your dictionary and you can do that by going to Tools - Add-ons - Get Add-ons (search for your dictionary)
Thing is that option is checked already, so I don't understand why it's not there.
Tools - options - Advanced - General (tab) - "Check my spelling as I type"
OH thank you Colleen! :)