@Edent By the way, installed PWAs can automatically register themselves as protocol handlers with the operating system: https://developer.chrome.com/articles/url-protocol-handler/. This works for the safe-listed schemes (https://html.spec.whatwg.org/multipage/system-state.html#safelisted-scheme), as well as for web+*. Some example apps that use it: https://developer.chrome.com/fugu-showcase/?api=protocol-handlers. URL protocol handler registration for PWAs - Chrome Developers