By default, single-line input fields in Firefox (including textareas) don't have spellcheck enabled. http://kb.mozillazine.org/Layout.spellcheckDefault http://k

By default, single-line input fields in Firefox (including textareas) don't have spellcheck enabled. http://kb.mozillazine.org/Layout.spellcheckDefault http://kb.mozillazine.org/Layout.spellcheckDefault So spellcheck might be enabled for the body text but not for the field where the headline goes.