I am using Thunderbird 91.8.0 and make use of tags to categorize messages. The tags are associated with colors and have names that I assigned to them. I.e. I am not using the standard 5 or so built-in names and colors that Thunderbird comes with but 8 tags with names and colors that I chose a long time ago. For a long time, the title (i.e. the text of the title) of a message that I had assigned a tag to had the color of the tag in the list with messages (for example my Inbox). The background of the whole message pane was white. That is, all message titles were displayed on a white background in my message pane and the title of the message was in black when it had no tag, and in the color of the tag when it did have a tag ([https://assets-prod.sumo.prod.webservices.mozgcp.net/media/uploads/gallery/images/2018-08-16-10-35-35-67cddd.png like here] like here). After a recent upgrade however, in my list with messages, all rows of messages with a tag now have a light shade of the tag color as background, i.e. not (let's say) red title on white background, as before, but red title on light-red background. I find this distracting and would like to change that back. I tried forcing a white background for the message pane by adapting my userchrome.css like this, but that did not help: treechildren { background-color: #FFFFFF !important; } treechildren::-moz-tree-row { background-color: #FFFFFF !important; } Does anyone know how to restore my Thunderbird to showing a white background for all non-selected message titles in my message pane? Thanks so much in advance!