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CloseReview for Merriam-Webster by mjsk
Rated 5 out of 5 stars
Since Merriam-Webster is the industry standard, and I prefer not to take my chances with faulty and incomplete definitions and references, this is what I use. If you want inaccurate definitions and spellings, there are plenty of them out there.
This review is for a previous version of the add-on (20080326).To create your own collections, you must have a Mozilla Add-ons account.