Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.9.0
I haven't any if idea if anyone is still using the
aplwrap thing David Lamkins and I hacked together a few years ago,
but I just updated it, which mostly consisted of replacing a
couple of GTK+/glib things that had been deprecated. You can
also set the foreground and background colours now, in case you
want your screen(s) to be more attention-getting.