A major feature missing from the standard Mozilla installations up to version 1.5 is a spell checker for Composer, and for email. Fortunately, a Mozilla spell checker is in development, and already available at mozdev.org.
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To install the Mozilla spell checker:
- Download the appropriate spell checker xpi for your platform and Mozilla version.
- Open the downloaded file in Mozilla.
- Restart Mozilla.
If you write emails in more languages than English alone, you can even extend the Mozilla spell checker with additional dictionaries easily.

