InviTube/options/options.js

// Save options
document.querySelector("form").addEventListener("submit", (e) => {
  e.preventDefault();
  let instance = document.querySelector("#instance").value.trim();
  instance = instance.replace(/^https?:?\/?\/?/, '').replace('\/$');
  if (!instance) {
    return alert("Please fill out the fields!");
  }

  browser.storage.local.set({
    instance: instance,
  }).then(() => alert("Saved!"));
});


// Restore options
document.addEventListener("DOMContentLoaded", () => {
  browser.storage.local.get({
    instance: "yewtu.be",
  }).then((item) => {
    document.querySelector("#instance").value = item.instance;
  });
});