Firefox: Enable/Disable Spell Checker
Posted on Nov 19, 2007 under Firefox Tips |Enable or disable the spell checking feature that checks your spelling in web forms.
1. Type about:config in the address bar.
2. In the filter field type spell
3. Find the entry for layout.spellcheckDefault and double-click it.
4. Set the integer to 1 to enable the spell checker.
Set the integer to 0 to disable the spell checker.
You can also go to Tools >Options>Advanced and select Check my spelling as I type under the General tab.

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