Resolved an issue tonight with auto spell checking (in firefox) for the rich text fields. It should now be on by default. The fix was to disable the advanced HR plugin for tinymce and make the following changes to the tinymce javascript:

(tiny_mce.js)

Change: this._def("gecko_spellcheck",false); to this._def("gecko_spellcheck",true);

(tiny_mce_src.js)

Change: this._def("gecko_spellcheck",false); to this._def("gecko_spellcheck",true);