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CloseReview for Account Colors by Firefox user 53d1cf
Rated 5 out of 5 stars
I sorely miss this add-on, and didn't appreciate it enough in previous versions. For users like me with multiple accounts, colour coding made Thunderbird workflow so easy and intuitive. I hope this gets functionality comes back for current or future versions! Thank you DW-dev for supporting it for as long as you have.
To create your own collections, you must have a Mozilla Add-ons account.