$ xprop | grep WM_CLASS
WM_CLASS(STRING) = "Navigator", "Firefox"
.Ed
+.Pp
+Note that grepping for WM_CLASS flips class and name.
+In the example above the quirk entry would be:
+.Bd -literal -offset indent
+quirk[Firefox:Navigator] = FLOAT
+.Ed
.Sh FILES
.Bl -tag -width "/etc/scrotwm.confXXX" -compact
.It Pa ~/.scrotwm.conf