In terms of security, the only major advantage that I know of for Chrome/Edge is that they automatically check for leaked passwords. Otherwise, an already up and running Firefox is just as good — if not better — than those two, so switching would likely be a waste of time.
By the way, do you happen to know if there are any Firefox-exclusive extensions installed in your machine? That would make for the most compelling case, IMO.
You’re right! I got Firefox Desktop and Firefox Mobile mixed up. The latter does not support this feature. My apologies.