All our web designers work on multiple devices. It means they support almost all major browsers like Chrome, Firefox, Safari, Opera, Edge, IE, etc. But it usually depends upon which device is used while working on the website. So if we mention one name here then there might be chances that they may use another one also.
For example: If I am working on an Android phone then sometimes I need to check my iPad or iPhone version too. This thing happens very often with desktop users as well. They have to look at their laptop versions only but in the case of mobile users, they have to check multiple devices.