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updated reference to the mozillaZine Docs (rather than forum post referring to the same)
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To change how Firefox checks spelling and enable spell-checking on one-line and multi-line text fields, use about:config to set layout.spellcheckDefault to 2.

To edit your configuration, type about:config in the address bar and press Enter.

ReferenceReference

To change how Firefox checks spelling and enable spell-checking on one-line and multi-line text fields, use about:config to set layout.spellcheckDefault to 2.

To edit your configuration, type about:config in the address bar and press Enter.

Reference

To change how Firefox checks spelling and enable spell-checking on one-line and multi-line text fields, use about:config to set layout.spellcheckDefault to 2.

To edit your configuration, type about:config in the address bar and press Enter.

Reference

Added link that explains how to open preferences for editing, slightly longer explanation
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I've found the solution.

we have toTo change how Firefox checks spelling and enable spell-checking on one-line and multi-line text fields, use about:config to set layout.spellcheckDefault to 22.
http://kb.mozillazine.org/Layout.spellcheckDefault

To edit your configuration, type about:config in the address bar and press Enter.

Reference

I've found the solution.

we have to use about:config to set layout.spellcheckDefault to 2.
http://kb.mozillazine.org/Layout.spellcheckDefault

Reference

To change how Firefox checks spelling and enable spell-checking on one-line and multi-line text fields, use about:config to set layout.spellcheckDefault to 2.

To edit your configuration, type about:config in the address bar and press Enter.

Reference

Source Link
Mohammad Dayyan
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I've found the solution.

we have to use about:config to set layout.spellcheckDefault to 2.
http://kb.mozillazine.org/Layout.spellcheckDefault

Reference