Review for Merriam-Webster by Miriah
Rated 5 out of 5 stars
Minus the occasional invite to sign up for the unabridged version, I find I trust this dictionary over many others on the Internet. While Merriam-Webster does not have the sprawling etymologies of the OED, it has the correct connotations and usages of words. Although the Merriam-Webster site is frequently bogged down with advertisements, the add-on works quite flawlessly.
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.