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CloseReview for English (Australian) Dictionary by silichip
Rated 3 out of 5 stars
If it doesn't work then try using the (US) English dictionary v4.0 this works fine for me and suggest you use that add-on until an updated version is available for TB3.
This review is for a previous version of the add-on (2.1.1).To create your own collections, you must have a Mozilla Add-ons account.