var sleepInterval = 2200;
var sleep = 0;

function finda(txt) {
  let finds = Array.from(document.querySelectorAll("a")).filter((el) =>
    el.textContent.includes(txt)
  );
  console.log(txt + ": " + finds.length);
  return finds;
}

function downloada(txt) {
  finda(txt).forEach((el, i, arr) => {
    console.log(`Downloading ${txt}...`, el.href);
    const link = document.createElement("a");
    link.href = el.href;
    link.target = "_blank";
    link.download = "";
    link.click();
  });
}

finda("Rechnung").forEach((e, i, arr) => {
  setTimeout(() => {
    e.click();
    console.log(i, e);
    if (i === arr.length - 1) {
      setTimeout(() => downloada("Rechnung 1"), 1000);
      setTimeout(() => downloada("Rechnung 2"), 2000);
      setTimeout(() => downloada("Rechnung 3"), 3000);
      setTimeout(() => downloada("Rechnung 4"), 4000);
      setTimeout(() => downloada("Rechnung 5"), 5000);
    }
  }, sleep);
  sleep += sleepInterval;
});