It opens like an app, without an app store, and notifications arrive far more reliably. Takes about ten seconds.
This browser does not offer installing. Open the address in Chrome or Safari on a phone.
On iPhone, notifications only work after this. Opened from inside the browser, nothing reaches you.
In Chrome or Edge, an install icon appears at the right of the address bar. Safari on a Mac has Add to Dock in the File menu.
Exactly like any other app: press and hold the icon and remove it. Nothing is left behind, and your account is untouched.