Automatically spell checking single line text fields

Firefox 2 users may have noticed that the built-in spell checker does not automatically check single-line text fields, such as Instead, you need to open the context menu (right-click), and choose Spell check this field. With multi-line text fields (for example, the Detailed Comments box at, the spell checker is automatically turned on.

To get the spell checker to automatically check all text fields, enter about:config in the address bar. In the resulting page, search for the preference layout.spellcheckDefault.
Double-click on it, and change the value to 2.