Mozilla was testing a similar "Progressive Web Application" (PWA) feature but then discontinued it a couple years ago. There is work underway to relaunch a new design for it, but it probably will be a few months. See: https://connect.mozilla.org/t5/discussions/how-can-firefox-create-the-best-support-for-web-apps-on-the/m-p/85327/highlight/true#M32616 ''(Nightly is the "alpha test" version of Firefox)'' For now, you can create a desktop shortcut for a site, but it will open in a normal window and not an application-style window. ([[Create a desktop shortcut to a website]])