Kids safe browser full-screen

Please create a modification of the firefox or waterfox browser and make it kids safe.

1) make it always full screen.
(and automatically log in where username and password was already stored)


2) make it never show a url (browser will be set as default and icons on the desktop with url will be double clicked to open the browser)
The icon on the desktop is nothing more than a link “www.netflix.com” for example.

3) make it never pop up a message if you want to save a password (just always automatically save password)


4) make a blue highlight of clickable buttons on website that can be controlled with keyboard keys:
arrow up, arrow down, arrow left, arrow right and enter (no other buttons on the keyboard needed)


5) remove any of the settings (only allow a specific url link with hashtag setting to open the settings menu)

6) remove most settings that are not needed