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As you know, we can enable the spell checker on single line text boxes in the following way:

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We have to enable it every time for checking words.

How we can enable it forever so it doesn't need to be enabled each time?

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up vote 7 down vote accepted

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

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