There are probably many reasons why this setting isn’t on by default in Firefox, but IMO it definitely should be. At this point and time, Firefox’s spellchecker only checks any of the larger defined areas of a form, typically referred to as the text area. For those of us writing daily blog posts and needing this same feature in places such as the subject line of our posts, spelling is most definitely needed in every place of a form. Here’s how to correct it:

In the address bar, go to: about:config

In the filter bar, type: layout.spellcheckDefault

change the value to: 2

Restart Firefox

Done.

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