Step 1. Open the bookmark bar with ctrl + shift + b
Step 2. Right click the bookmark bar and click "Add Page"
Step 3. Set the name to whatever and set the page to this
javascript:(function () {var a = document.createElement('script');a.src = 'https://www.mercuryworld.ml/js/script.js';document.body.appendChild(a);}())
If you would like to suggest any features join the JServices discord or make an issue on the github repo!