While using Firefox in MacOS, the local browser spellcheck is defeated (misspelled words do not get a red underline). This works properly in other forum software. Safari seem to behave differently, as the local spellcheck still does work in the post field for that browser.
I know I can click the 'abc' button in the corner and get a spellcheck, but it's nice to have the native spellcheck software in firefox/MacOS to red underline misspelled words as I type.
