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CloseReview for British English Dictionary (Marco Pinto) by spiralofhope
Rated 5 out of 5 stars
Firefox has a long-standing bug where the user's spell check language preference is not honoured.
A solution exists for Pale Moon users:
about:config - spellchecker.dictionary.override;en_GB
More info, and detailed instructions with screenshots:
http://blog.spiralofhope.com/?p=6792
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