90% useless! Even if images are on the same domain in a sub-domain, it does not find images. No matter what you set. I had around 100 images on one page (linear - no sub-domains no other server, simple image list) and after 48 images, the search can't find any more! In addition, Firefox or the system is extremely busy, consumes masses of memory and is extremely slow when searching. You are faster with manual search!