Assuming icab is required, the following result was found.
Explorer 4.0, Netscape Navigator 4.0, Netscape Communicator 4.0, Opera 3.0, Amaya 1.0 70 1998 Internet Explorer 5.0 Beta 1, iCab, Mozilla 147 1999 Amaya 2.0, Mozilla M3, Internet Explorer 5.0 248 2000 Konqueror, Netscape 6, Opera 4, Opera 5, K-Meleon...