Query with Parameters and Wildcards

I have a query that works on SQL Server to return customers that contain the
string entered by the user by accepting parameters and using the LIKE
keyword. I would like to move this to postgreSQL but I'm just not sure how
to get it done. This is the query 

SELECT * FROM Customers WHERE FirstName LIKE @custfirst + '%'; 

This works great on SQL Server but not on postgreSQL. Any help would be
appreciated.
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