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Apparently "Firefox automatically checks the spelling of words that you enter in text boxes" but is there a way to have it check other texted based fields, such as <input type="text" />?

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Type about:config in the address bar, agree to the warning if displayed, then set the value of layout.spellcheckDefault to 2.

0: Disable spellchecker.

1: Enable spellchecker for multi-line controls (e.g., <textarea>s). (Default in Firefox and SeaMonkey)

2: Enable spellchecker for multi-line controls and single-line controls. (Default in Camino)

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