Welcome to Firefox for Android Add-ons.
Add extra features and styles to make Firefox for Android your own.
CloseReview for Account Colors by turbodent
Rated 5 out of 5 stars
I used to LOVE this when it worked, thanks to the author for all these good years... :)
For those interested in a similar solution, you may want to look into BorderColors D
https://addons.thunderbird.net/en-GB/thunderbird/addon/bordercolors-d/?src=search
To create your own collections, you must have a Mozilla Add-ons account.