Progressive Web App. It is the technical term for a website that you can kinda install as an app on your mobile. If you open the website on your browser and the open the hamburger menu (3 dots) you will find the option to install it.
Shit I meant the desktop on my phone, sorry for the confusion if that happened. Main screen? Menu screen? What is called? I'm used to calling the same thing across devices the desktop.
Firefox. it lets me create the icon but when i launch it the screen randomly flickers and then nothing happens. It was working fine up until just today, possibly related to the update but I don't know.