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CloseReview for British English Dictionary by lotuspods
Rated 5 out of 5 stars
This download is a stuffed file so I unstuffed it, selected the app icon> right click > show package contents > MacOS > dictionaries and drop them in there, alongside the two you have already.
This review is for a previous version of the add-on (1.19).To create your own collections, you must have a Mozilla Add-ons account.