Windows 11 Having waited until some of the most valuable Thunderbird addons were updated for 115, I have now updated to the latest version of Tbird. I had previously set up userchrome.css to show gridlines between columns and under each message in the Message pane, thus avoiding having a lot of messages just sitting in a white "unanchored" space. Of course, the old css doesn't work in 115. Has anyone worked out how to get back the gridlines here, either in css or some other method?