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CloseReview for Account Colors by Adrian
Rated 5 out of 5 stars
Love this extension! A must have if you have more than one email account and/or use the Unified Folders view.
My only suggestion would be to have a convenient default for some settings. It was confusing when nothing happened after choosing a background color on all my accounts, then to find out I had to mess with the "Color ... Background" checkboxes in the options in order for it to be applied.
To create your own collections, you must have a Mozilla Add-ons account.