Which method do you use to do this?
I use Wizmage Image Hider -- that works surprisingly well for the vast majority of images, and it does a great job of keeping content aligned so that it doesn't screw things up too badly. Only very rarely does Javascript nefariousness let an image slip through it -- overall it's a fantastic Chrome extension.
https://chrome.google.com/webstore/detail/wizmage-image-hide...
I'm curious to hear what method you use?