Hi bwj1, Thank you for your question. If you right click in an editable text field do these options show up? [[How do I use the Firefox spell checker?]] It is also possible to clear the cache and cookies: [*For Firefox: Press CTRL+SHIFT+DEL simultaneously and click Clear Now] [https://addons.mozilla.org/en-US/firefox/language-tools/] It could also be a stored option on the website: "On the top navigation bar on Outlook. After you click "Spell check," all misspelled words in your message body will be underlined in red. You can then left-click the word to get a pop-up list of corrections." Reference [http://webapps.stackexchange.com/questions/41870/where-to-find-spell-check-on-outlook-com]