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CloseReview for Developer Assistant by johnath
Rated 5 out of 5 stars
Like Firebug for web developers, this extension is a must-have for anyone working on extensions, and is actually pretty useful for web devs as well, really. Not for casual users, but a necessary tool for power users.
This review is for a previous version of the add-on (0.3.0.20080526).To create your own collections, you must have a Mozilla Add-ons account.