This brief tutorial will show you how to enable spell check in web page forms (text input fields) in Firefox.
- Start by entering about:config in the Firefox address bar (without the http://)
- In the Filter: field, enter layout.spellcheck to bring up the layout.spellcheckDefault preference.
- Double-click that entry and change the integer value from 1 to 2 and click OK.
- Open a new browser window or tab (or refresh an existing one) and test it out.