[].forEach.call( document.querySelectorAll('input[type="checkbox"]'),function(el){
       el.checked=true;
     }
  );​

  
  javascript:[].forEach.call(document.querySelectorAll('input[type="checkbox"]'),function(el){el.checked=true});
  
Bouton Selectionenr tout dans "Echange Sécurisé"
  
  document.querySelector("#weInboxContainer > div.flexCenter.messageListToolsContainer")

  <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" height="18" width="18" onclick="[].forEach.call(document.querySelectorAll('input.ng-valid[type=&quot;checkbox&quot;]'),function(el){el.click()});"><path d="M12.9993 3L12.9991 10.267L19.2935 6.63397L20.2935 8.36602L14.0001 11.999L20.2935 15.634L19.2935 17.366L12.9991 13.732L12.9993 21H10.9993L10.9991 13.732L4.70508 17.366L3.70508 15.634L9.99808 12L3.70508 8.36602L4.70508 6.63397L10.9991 10.267L10.9993 3H12.9993Z"></path></svg>

Selectionner tout les post it en mode Archivage:
  
  javascript:[].forEach.call(document.querySelectorAll('input[type="checkbox"]'),function(el){if(el.name.includes('TreeViewPostItReadsn')){el.click();}});


  javascript:[].forEach.call(document.querySelectorAll('input[type="checkbox"]'),function(el,index){if(index < 10){el.click();}});