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CloseReview for Automatic Dictionary by Onno Zweers
Rated 5 out of 5 stars
I used to switch between English and Dutch spell checking many times per day. First I was looking for an addon that would recognize the language I was typing, but this perhaps even works better.
This review is for a previous version of the add-on (1.2.0.1).To create your own collections, you must have a Mozilla Add-ons account.