Hello all! I just learned how to do this and I figured that it would be good to share here for the sake of information sharing.
I wanted to change the icon on my web browser tab to a customers’ logo instead of the default B&R logo. I was struggling finding the answer to how to do this in the help, but it turned out to be very simple. Just paste the line below into the configuration section of the .vis file and change the filename to your desired icon in the mappView/Resources/Media folder in your AS project.
Yes, it is also possible to change to boot logo. Have a look onto the following configuration keys. One definies the background color and the other one the logo.