This addon uses the existing, built-in dictionary and word suggestion algorithm. Rather than replace the existing spell checker Spellbound enables you to spell check entire pages at once!
To check spelling with SpellBound, you can use the “Spell Check with SpellBound” option in the drop down context menu after right clicking in the text field, or you can add the “Spell” button to your toolbar with the Firefox customize toolbar window and use it. You may also use the keyboard shortcut that is set to “Ctrl+Shift+F7″ by default.
This addon will set in-line spell checking on for single line fields as the default behavior.