How to fix tab key

How do I...?
1

I want to make a fly-out menu using the tab key. However, it’s trying to change the focus to the address bar, bookmark button, etc. on my browser. How do I prevent this action and reserve the tab key for my game?

I know JavaScript, including event.preventDefault(), but I don’t know how I would implement it in my game.

My current code for the menu|690x87.420
My current code for the menu|690x87.420830×105 23.1 KB

2

Solved it.
Just had to add this JS to run at the beginning of the scene:

document.addEventListener('keydown', function(event) {
    if (event.key === 'Tab' || event.keyCode === 9) {
        event.preventDefault();
    }
});

Attached is an extension for people with a similar problem, but without the need for a giant JavaScript block in your events sheet.
drive.google.com/file/d/1ZxDPlDZNEYx69Loo8j6siUL7J3Oik5gn