Firefox by default enables spell check for textarea controls only and this is little annoying. Here are the steps that you can use to enable spell check in both multi line and single controls.
Enter about:config in Firefox address bar. And search for following key.
Change the value of the key to 2.
Following are the possible values above key takes.
- 0 - Disable spellcheck all to gather
- 1 - Only enable spell checking for multi line controls.
- 2 - Enable spell checking for both multi line and single line controls i.e both text fields & text areas.