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Spell checker not working

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Since upgrading to Firefox 5, the spell checker no longer works.

Since upgrading to Firefox 5, the spell checker no longer works.

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https://support.mozilla.com/en-US/kb/Using+the+spell+checker

If you are using a version of Firefox other than the English / United States version, you may need to install a spell check dictionary. If you already installed the correct dictionary for your localized version in a previous version of Firefox, maybe it didn't get updated after 5.0.1 was installed.

You can re-install that dictionary from here:
https://addons.mozilla.org/en-US/firefox/language-tools/