About waking at 5:00 AM
Five is the hour the productivity literature romanticises. It works for genuine morning chronotypes and quietly wrecks the week for everyone else — chronotype is substantially genetic, and forcing an early schedule against it produces measurable social jetlag rather than discipline.
Leave the tab open
A browser alarm can only ring while its page is open. It does not have to be the tab you are looking at, and on a desktop it does not have to be the window in front — but closing the tab or quitting the browser stops it. For anything you genuinely cannot miss, set a second alarm on your phone as a backup. That is true of every browser-based alarm clock, not just this one.