How to play the French Sicilian as black?


You can play the Wing Attack against the open Sicilian if you want to solve that “problem bishop”.
You can also concede with b6 when white plays c4 or a4, transposing to a Katilimov or Hedgehog set up.
https://www.chess.com/game/live/83711377599

To win in the e6 Sicilian, you have to grasp how to fight for the e5 square and control or patrol the dark squares.
Trading your DSB for whites, generally equalizes the game.

Here, I can overload the e5 square with my knights and queen.
Other times, I will let white have e5 to keep the e file closed and my king is safer than castling giving me counter play with h5.
The bishop can go to e7, notice how many dark squares it controls and enables a b4 pawn push that pushes Nc3 to an undesirable square.

It doesn't exist.
Some drunk on chess.com that entered names into the database made about 100 or so errors, and one of them is saying that 1.e4 c5 2.Nf3 e6 is the "Sicilian Defense, French Variation", which is not true and a bunch of BS. There is no variation name for this. It is the Sicilian Defense. Now 3.d4 cxd4 4.Nxd4 a6 is the Kan Variation while 3.d4 cxd4 4.Nxd4 Nc6 is the Taimanov Variation, but there is no "French Variation".
Chess.com is not a reliable source at all when it comes to Opening names. It is littered with errors.