For months now Thunderbird will not properly following my userChrome code to change new mail to a different color. It used to be with just some accounts and not others. Now it is all accounts. New mail is supposed to turn green. Now It reverts to my default color of white, not even my unread mail color of blue. Nor does the highlight on new/unread mail activate on those folders until I click on it. They're all imap. It appears this most frequently happens to all accounts when I am working in another program and Thunderbird is not selected. When I am in the program it appears that the account I'm in works OK, but others don't. Then I have to hunt and search for the hard-to-see white number next to my folder, or worse, go clicking through all my unread folders that are properly turning blue to see if new message are in there. Many times they are, and will then turn green once I click the folder. This used to work fine. I've tried every variation of userChrome settings, including putting all possible variables in to make sure it turns green, and nothing fixes it. It's been suggested to me by other users that this is a bug. Suggestions?