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How do I make Firefox use the built in Mac OS X spell checker?

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I want to use the built in Mac OS X spell checker in Firefox, instead of the one that Firefox ships with. I have a lot of words I've told it to learn and in general, it's just more accurate (today, Firefox's spellchecker said that "immersive" wasn't a word, even though Mac OS X's spellchecker confirms that it actually is).

I've tried going to Preferences -> Advanced and unchecking "Check my spelling as I type", but that doesn't make Firefox default to the Mac OS X spellchecker. I tried Right-Clicking in the text field and choosing Languages -> Add Dictionaries…, but that doesn't let me add the Mac OS X spellchecker as a dictionary.

Is there any way at all that I can make Firefox use the superior spellchecker built into Mac OS X?

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That addon specifically says in its description "It uses Firefox's inbuilt dictionary to check the spellings."

Firefox is already using its inbuilt dictionary. I want it to use the one built into Mac OS X!