async function saveOptions() {

  const server = document.getElementById("server").value;
  const domain = document.getElementById("domain").value;
  const apikey = document.getElementById("apikey").value;

  await browser.storage.local.set({
    server,
    domain,
    apikey
  });

  document.getElementById("status").textContent = "Saved!";
}

async function restoreOptions() {

  const data = await browser.storage.local.get([
    "server",
    "domain",
    "apikey"
  ]);

  document.getElementById("server").value = data.server || "";
  document.getElementById("domain").value = data.domain || "";
  document.getElementById("apikey").value = data.apikey || "";
}

document.getElementById("save").addEventListener("click", saveOptions);
document.addEventListener("DOMContentLoaded", restoreOptions);