Core Web Vitals Annotations

100% useless. This extension automatically turns off every time you load a page. So, when you want to see what's causing the layout shifts that are killing your pagespeed performance score, when you load the page, you have to race to manually activate the extension for the page before it actually begins loading, which is, of course, humanly impossible. Then, whatever you do click it in time to show, it puts frames around things that have shifted, giving you exactly zero idea of what caused them to shift, so even if it worked from the beginning of the page load, it wouldn't be helpful in any way. Because you still don't know what caused the shifts.

Works as shown, great tool!