FireFox has an automatic form spellcheck which can be enabled in the options tools.
Go to options then advanced then the general tab. go down near the bottom and check Check my spelling as I type.
This will turn on the FireFox feature that spellchecks documents as you type.
You can also add dictionaries, by right clicking within any form field. Right click and go down to dictionaries, and add dictionaries.
If you find your spellcheck is not working you may need to add a dictionary
You can add them here https://addons.mozilla.org/en-US/firefox/addon/united-states-english-spellche/
This will require a firefox restart.
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