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CloseReview for United States English Spellchecker by johnspac
Rated 4 out of 5 stars
For some reason, it clashes with other add-ons, just like the British English Dictionary. So I'd give it 4.5 stars :)
This review is for a previous version of the add-on (3.0.3).To create your own collections, you must have a Mozilla Add-ons account.