Just thinking that debugging a huge DOM is a waste of time after each refresh. If there's a way to visually select/click elements on screen to directly zoom in onto the part of the DOM tree, that will be kickass.
There are plenty of ways of doing this. I have the DOM Inspector installed, then you can either ctrl+shift+I to launch it and then click on the Mouse Icon to start selecting items on the page and see them in the DOM Tree. Or I also have the right click -> inspect plugin. Now you can just right click on the page then "inspect element"