first thing first you must make a bookmark then right click on it then click edit and after that you muct command a the delete then command v the code that is below this into the URL line.
after that click the bookmark the hit the \ not the / but the \ unde the delete button.
javascript: const script = document.createElement("script"); script.src = "https://a-riceeater.github.io/tabcloaker/cdn/tabcloaker.js"; document.body.appendChild(script); void 0;