Add-ons
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Lexiology.com Dictionary
Lexiology.com Dictionary of American English: This dictionary has a very nice Web 2.0 browse interface. It contains definitions/meanings, audio, phonetics, usages and other information. Searched word can be added in the personal word-list.
WordStash.com
The WordStash add-on adds a lookup search bar to the upper right that allows you to lookup simple definitions and save them to your WordStash account.
To create your own collections, you must have a Mozilla Add-ons account.
