Script to run from the browser console whist on the Wikilocs maps page. It will display options to show all trails in the map

show-all-wikilocs-trails-on-map.js

function showAllMaps() {
  let xpath = "//*[contains(@class, 'trail-list__show-on-map') and contains(text(), 'Show on map')]";
  let elements = document.evaluate(xpath, document, null, XPathResult.UNORDERED_NODE_SNAPSHOT_TYPE, null);
  for (let i = 0; i < elements.snapshotLength; i++) {
    if (elements.snapshotItem(i).style.display == "none") {
      continue;
    }
    let title = jQuery(elements.snapshotItem(i)).closest("h3");
    console.log("Showing map for " + title.innerText);
    elements.snapshotItem(i).click();
  }
}

function hideAllMaps() {
  let xpath = "//*[contains(@class, 'trail-list__show-on-map') and contains(text(), 'Hide')]";
  let elements = document.evaluate(xpath, document, null, XPathResult.UNORDERED_NODE_SNAPSHOT_TYPE, null);
  for (let i = 0; i < elements.snapshotLength; i++) {
    if (elements.snapshotItem(i).style.display == "none") {
      continue;
    }
    let title = jQuery(elements.snapshotItem(i)).closest("h3");
    console.log("Hiding map for " + title.innerText);
    elements.snapshotItem(i).click();
  }
}


function showOrHideMaps() {
  let checkbox = document.getElementById("showAllMapsCheckboxInput");
  if (checkbox.checked) {
    showAllMaps();
  }
}
function addFloatingShowAllMapsCheckbox() {
  var div = document.createElement("div");
  div.innerHTML = `
    <div  id="showAllMapsCheckbox"
          class="showAllMapsCheckbox draggable"
          style=" position: fixed; top: 20px; right: 20px; z-index: 1000; width: fit-content;
                  background-color: white;
                  box-shadow: 0px 0px 10px #888888;
                  padding: 5px;
                  border-radius: 5px;">
      <input  type="checkbox" id="showAllMapsCheckboxInput"
              style="margin-right: 5px;"
              onchange="updateShowAllMapsCheckboxInputValue();">
      Show all maps
    </div>
  `;
  jQuery(document.body).append(div);

  setTimeout(function () {
    let showAllMapsCheckboxInput = document.getElementById("showAllMapsCheckboxInput");
    let showAllMapsCheckboxInputValue = localStorage.getItem("showAllMapsCheckboxInputValue");
    if (showAllMapsCheckboxInputValue != null) {
      showAllMapsCheckboxInput.checked = showAllMapsCheckboxInputValue == "true";
    } else {
      showAllMapsCheckboxInput.checked = false;
    }
    jQuery("#showAllMapsCheckbox").draggable();
  }, 0);

  setInterval(showOrHideMaps, 1000);
}

function addFloatingGoThroughAllPagesCheckbox() {
  var div = document.createElement("div");
  div.innerHTML = `
    <div  id="goThroughAllPagesCheckbox">
      <input  type="checkbox" id="goThroughAllPagesCheckboxInput"
              style="margin-right: 5px;"
              onchange="goThroughAllPages();">
      Go through all pages
    </div>
  `;
  jQuery("#showAllMapsCheckbox").append(div);
  setTimeout(function () {
    goThroughAllPages();
  }, 0);
}

function addRefreshToClearResultsButton(){
  var div = document.createElement("div");
  // a tag to refresh the page keeping the search parameters
  div.innerHTML = `
    <div  id="refreshToClearResultsButton">
      <a href="javascript:void(0);" onclick="window.location.href = window.location.href;">Refresh to clear pinned trails</a>
    </div>
  `;
  jQuery("#showAllMapsCheckbox").append(div);
}

function goThroughAllPages() {
  let goThroughAllPagesCheckboxInput = document.getElementById("goThroughAllPagesCheckboxInput");
  if (goThroughAllPagesCheckboxInput.checked) {
    interval = setInterval(function () {
      let nextButton = document.getElementsByClassName("pagination__next-page")[0];
      if (nextButton == null) {
        console.log("No next button found");
        clearInterval(interval);
        goThroughAllPagesCheckboxInput.checked = false;
        return;
      }
      console.log("Next button found");
      nextButton.click();
    }, 1500);
  }
  else {
    console.log("Stopping interval: " + interval);
    if (interval != null) {
      clearInterval(interval);
    }
  }
}


function updateShowAllMapsCheckboxInputValue() {
  let showAllMapsCheckboxInput = document.getElementById("showAllMapsCheckboxInput");
  localStorage.setItem("showAllMapsCheckboxInputValue", showAllMapsCheckboxInput.checked ? true : false);
}

function ensureJQueryIsLoaded() {
  if (typeof jQuery == 'undefined') {
    var script = document.createElement('script');
    script.src = 'https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js';
    script.onload = ensureJQueryIsLoaded;
    document.getElementsByTagName('head')[0].appendChild(script);
    return false;
  }

  console.log("jQuery is loaded");
  if (typeof jQuery.ui == 'undefined') {
    var script = document.createElement('script');
    script.src = 'https://ajax.googleapis.com/ajax/libs/jqueryui/1.12.1/jquery-ui.min.js';
    script.onload = ensureJQueryIsLoaded;
    document.getElementsByTagName('head')[0].appendChild(script);
    return false;
  }
  console.log("JQuery UI is loaded");
  return true;

}

var showAllMapsCheckboxInitializationInterval = setInterval(function () {
  if (ensureJQueryIsLoaded()) {
    clearInterval(showAllMapsCheckboxInitializationInterval);
    addFloatingShowAllMapsCheckbox();
    addFloatingGoThroughAllPagesCheckbox();
    addRefreshToClearResultsButton();
  }
}, 1000);

Example result:

Use these checkboxes to control it