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CloseReview for English (en-GB) Language Pack by Firefox user 4b7d41
Rated 5 out of 5 stars
I managed to install a downloaded dictionary but not in the way others have advised because there was no gog on the add on page as many others have stated. Therefore, I tried all the other options such as extensions and languages and hey presto there is the gog to install your download.
This review is for a previous version of the add-on (52.0).To create your own collections, you must have a Mozilla Add-ons account.