Firefox Inline Spell Checker

Firefox includes a built in spell checker. However, by default this does not check when  typing into a single line entry box (e.g. the comments box on Facebook or the Google search box).

Firefox Inline Spell checking example

How to make Firefox spellchecker check for spelling errors inline

1. Open a Firefox window
2. Type about:config into the address bar and press enter:

   

3. Accept any warning to continue
   
4. On the next page
1. type the layout.spellcheckDefault in the filter field
2. Double click the integer value 1
3. Enter an integer value of 2 
4. Click OK to accept the new setting:

That’s all there is to it. Next time you run Firefox and begin typing into a single line form field (or multiline) spell checker will check your spelling for mistyping’s as you type.