It seems the thunderbird issue is actually an issue in xdg-open, see: https://bugzilla.mozilla.org/show_bug.cgi?id=1613425 https://bugzilla.mozilla.org/show_bug

It seems the thunderbird issue is actually an issue in xdg-open, see: https://bugzilla.mozilla.org/show_bug.cgi?id=1613425 https://bugzilla.mozilla.org/show_bug.cgi?id=1613425 https://gitlab.freedesktop.org/xdg/xdg-utils/-/issues/177 https://gitlab.freedesktop.org/xdg/xdg-utils/-/issues/177 So you are only affected if your system uses xdg-open to parse mailto links.