Rated 4 out of 5 stars

A very strong candidate replacement for Colorzilla. Some accuracy issues around the "Website Analyzer" feature but the "Library" feature is an excellent addition and very useful for designers or developers.
The add-on is generally very intuitive to use although "bookmarking" colors to the library may cause some initial confusion with other URL bookmarking tools such as XMarks or Firefox Sync.
All things considered, this is a very useful and usable addition to a web designer's kit.

This review is for a previous version of the add-on (