1. How widespread is Fireflies? Is it really a good opportunity?
It is not widespread at all, and because of the increasing numbers of travellers it is a great chance. Already more than a billion people travel every year and this number is increasing. Only in a Central European country: in Hungary, just the hungarian travellers spent around 200 million euros (!) only for domestic journeys in 2014. It means people go for a journey, travel and book hotels.
2. Can it be possible that i can not book a flight ticket at other online portals and with Fireflies i can do it?
Is it cheaper to book flight tickets at Fireflies?
All airline company counts not in dollars, but their prices are given in British pounds. First British Pounds are converted to euros, then euros are converted to other currencies. Due to one or two conversion, there is exchange loss. At Fireflies you can directly see prices in British Pounds. There is no exchange loss.
The Wizzair living system is also connected to Fireflies. Although there are no seats reserved by Fireflies, but Fireflies has an incredibly large assortment of 920(!) Flight companies in its system.