Review for Account Colors by Nat
Rated 4 out of 5 stars
Not sure what to advise. No other users have reported similar problems. Perhaps you have another add-on that conflicts with Account Colors.
=>I do not think so. The problem stay when I remove all addons .
Is the hightlighting (bold/underline) of new mail and unread messages in accounts and inboxes still working correctly in Folder Panel?
=> Yes
To create your own collections, you must have a Mozilla Add-ons account.