This will add Safari 12 and later to the list of browsers that Citrix Receiver Launcher will be used. For StoreFront deployments, modify web.config under the Receiver for Web (RfWeb) site (typically C:\inetpub\web.config using your preferred text editor and locate the line : Ģ. The value of the platforms attribute is a regular expression specifying the browsers that Citrix Receiver Launcher is used for client detection and HDX launches.