I'm sure Liverpool will find a replacement for Firmino and not sure Mbappe will move to Liverpool even though Liverpool have quite a lot of money, because it seems Mbappe is more interested in Madrid than Liverpool and playing in the EPL, talking nonsense seems to never end that's why a lot of media who continues to force things that are difficult to discuss like this. after all Liverpool will not be able to buy Mbappe from PSG.
I'm sure PSG charge high or expensive fees so it's difficult for Liverpool to bring him to Anfield, but even so the club that makes the most sense is madrid and I'm sure Mbappe even though he will move from the PSG club he will play in madrid more than in any other league including Liverpool EPL.
Due Liverpool not participants in Champion League next seems difficult for signing Mbappe and actually highest fees transfer have to pay for PSG, has unique clause between Mbappe and PSG if extend one year or stay until his contract will get bonuses from 60 to 90 million euro and Liverpool won't to pay that bonuses if want sign Mbappe. Liverpool need to find right replacement for position leaving by Firmino but Mbappe almost difficult for signing before his contract over with PSG.
Jurgen Klopp not worry about their attacking line exactly current transfer after success signing Dominik Szoboszlai from RB Leipzig with €70 million fees transfer, Jurgen Klopp looks priority with midfielder position than forward after success signing two best midfielder right now from Alexis Mac Allister and Dominik Szoboszlai.