When I need to inspect multiple popup or dropdown elements that disappear on blur, I use this handy snippet:

1. Open DevTools → Console

2. Paste the code below and press Enter

    window.addEventListener('keydown', function (event) {
       if (event.key === 'F8') {
         debugger;
       }
     });
   

3. Press F8 (or change the key) anytime to trigger debugger; and pause execution

This makes it easy to freeze the page and inspect tricky UI elements before they vanish.