Hmm strange, I have never had a thunderbird folder in my home dir. I use thunderbird on Mac, Windows and Linux (Ubuntu).
It's been an ongoing issue since the beginning of the year, at least on Linux. Since you're using Ubuntu (which is based on Debian), you may be using an older or an LTS version. https://bugzilla.mozilla.org/show_bug.cgi?id=2007074
alt Hacker News
It's been an ongoing issue since the beginning of the year, at least on Linux. Since you're using Ubuntu (which is based on Debian), you may be using an older or an LTS version. https://bugzilla.mozilla.org/show_bug.cgi?id=2007074