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CloseReview for Account Colors by Vincent
Rated 4 out of 5 stars
Very nice extension.
Unfortunately it make TB3.1 (Lanikai) hang on opening of a new tab (single message or search result displayed as list).
This problem is fixed in Version 3.3 which works with Thunderbird 3.1.
To create your own collections, you must have a Mozilla Add-ons account.