Note: After saving, you have to bypass your browser's cache to see the changes. Google Chrome, Firefox, Microsoft Edge and Safari: Hold down the ⇧ Shift key and click the Reload toolbar button. For details and instructions about other browsers, see Wikipedia:Bypass your cache.
// Remove whitespace from watchlist margin
if (mw.config.get('wgPageName')=="Special:Watchlist") {
  var wlm=document.querySelectorAll("td.mw-enhanced-rc");
  for (var i=0; i<wlm.length; i++) {
    var wlmHTML=wlm[i].innerHTML.replace(/&nbsp;/g,""), wlmChar=wlmHTML.substr(wlmHTML.length-3,1);
    if ((wlmHTML.length>5) && (wlmChar==":")) { // Move timestamp to beginning
      wlm[i].innerHTML=wlmHTML.substr(wlmHTML.length-5,5)+"&nbsp;<small>"+wlmHTML.substr(0,wlmHTML.length-5)+"</small>&#x202F;"; }
    else wlm[i].innerHTML=wlmHTML+"&nbsp;" }}

// Custom inserts
window.charinsertCustom={ "Wiki markup":' {\{u|+}}  {\{ping|+}}  <code><nowiki>+</nowiki></code> \n Smilies:  🙂: {\{smiley|1}}  😉: {\{smiley|3}}  😀: {\{smiley|5}}  😛: {\{smiley|7}}  😠: {\{smiley|26}}  😺: {\{kitty}} ' };

// Add a "Show preview and changes" button
mw.loader.load("https://en.wikipedia.org/w/index.php?title=User:Writ_Keeper/Scripts/previewAndDiff.js&action=raw&ctype=text/javascript");

// Automate purge confirmation dialog
if (mw.config.get('wgAction')==='purge') $('form[action*="action=purge"]').submit();