Five-time gold medallist Ellie Simmonds expects Tokyo 2020 to be her final Paralympics.
Great Britain’s opening ceremony flagbearer failed to win a medal in the Japanese capital after finishing fifth in Thursday’s S6 400m freestyle final, having successfully challenged her initial disqualification.
She previously came fourth in the SB6 100m breaststroke and fifth in the SM6 200m individual medley, with 19-year-old team-mate Maisie Summers-Newton claiming each of those titles.
Northern Ireland swimmer Firth retained her S14 100m backstroke crown in a time of 1:05.92, with team-mate Jessica-Jane Applegate taking bronze, just over two seconds behind.
Firth, 25, has now won the event at three successive Games, moving her on to a total of eight Paralympic medals, having also picked up two silvers in Japan.
Meanwhile, Reece Dunn collected the fourth medal of his debut Games, adding S14 100m backstroke bronze to freestyle and individual medley golds and butterfly silver.
The 25-year-old touched the wall in 59.97, with compatriot Jordan Catchpole 3.23secs slower in fourth.
