@Venetia, it's very sad that the progress page shows "The issue is highly OS-specific and this bug only covers addressing the issue on Windows." I'm on Ubuntu Linux. Any chance this will ever get fixed for me?
It seems like this is not likely to get fixed, but on my own computers I have found a solution that keeps me from losing work. With help from the following page, I did what I had to do:https://askubuntu.com/questions/1387081/firefox-notify-me-before-...
