(function(exports) {

  if (location != 'chrome://messenger/content/messenger.xhtml') return;

  const doc=gTabmail.tabInfo[0].chromeBrowser.contentWindow.document;

  //Icon Spalten justierbar machen
  const cols=['attachmentCol', 'unreadButtonColHeader'];
  exports.easyPeasy.makeIconColResizable=() => {
    for (const id of cols) {
      const th=doc.getElementById(id);
//console.log('icon col '+id+' '+th.style.cssText);
      th.setAttribute('data-resizable', 'true');
      //th.style='width: var(--'+id+'Splitter-width); '+th.style.toString(); //--'+id+'Splitter-width: 30px;';
      th.style='width: var(--'+id+'Splitter-width); '+th.style.cssText; //--'+id+'Splitter-width: 30px;';
      const hr=th.querySelector('hr');
      hr.removeAttribute('disabled');
//console.log('icon col now '+id+' '+th.style.cssText);
    }
  }

  //on initial startup, "folderURIChanged" fires too early
  gTabmail.tabInfo[0].chromeBrowser.contentWindow.addEventListener("allMessagesLoaded",
    ()=>{
      exports.easyPeasy.makeIconColResizable();
      //make icon cols resizable after a switch of folders
      gTabmail.tabInfo[0].chromeBrowser.contentWindow.addEventListener("folderURIChanged",
        exports.easyPeasy.makeIconColResizable
      );
    },
    { once: true }
  );

})(this);