Agree; and in general I think people underestimate how heavy and potentially dangerous extensions are. Adding an extension is like loading an additional webpage on each primary page load, and it can make as many requests and consume as many resources as it wants. It can also interfere with or alter the behavior and performance of the primary page in any manner that the DOM allows. As a web dev who has investigated a lot of performance complaints, disabling extensions is one of my first debugging steps.