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CloseReview for Account Colors by SamSriLanka
Rated 5 out of 5 stars
Talk about FANTASTIC!
This makes Thunderbird a pleasure to use, giving different colours to different accounts, folders etc., but but BY FAR THE BEST THING is the ability to CHANGE FONT SIZES which I have been unable to do in any other way since the last updates to Thunderbird!!!
To create your own collections, you must have a Mozilla Add-ons account.