Hi Harold, Firefox should spell-check multi-line text fields (like this box I'm typing in) by default. Does your right-click context menu have Check Spelling, either with or without a check mark? ''If you want to also have Firefox spell-check single line fields, you need to change a hidden setting:'' (1) In a new tab, type or paste '''about:config''' in the address bar and press Enter/Return. Click the button accepting the risk. ''More info on about:config:'' [[Configuration Editor for Firefox]]. ''The moderators would like us to remind you that changes made through this back door aren't fully supported and aren't guaranteed to continue working in the future.'' (2) In the search box in the page, type or paste '''layout.spellcheckDefault''' and pause while the list is filtered (3) Double-click the preference to display an editing field, and change the value to '''2''' then press Enter or click the blue check mark button to save the change. (0 = Disable, 1 = Multiline, 2 = Multiline + Single line)