I've been using Thunderbird for many, many years and I've generally been happy. However, this release is full of problems. The popup for ''reminders'' has font issues. It's an ugly font but much more important, it doesn't show as much as it used to for the same width. Screen real estate is important so I have to keep each element small. Also, the popup beeps and reappears from time-to-time (even when there is nothing new to show). That's annoying but it has always done that. Now, however, it moves to whatever workspace I'm currently using (bad when I'm on a workspace other than where the main Thunderbird GUI is located). The new way that eMail addresses are done is not helpful. The earlier version allowed deleting and changing between TO, CC and BCC which was much easier. The font change on the folder display is not good. BTW- I'm using Ubuntu 18.04 LTS ''Firefox -> Thunderbird''