dont know if FF has equivalent extension but o got a extension for opera that links the thumbnails in Google directly to the source images. pretty sure FF could do this to, since it is just a simple bit of javascript doing that, do you could either find a extension to do it, or get greasemonkey and find a userscript to do…
Hey! Try the coolpreviews addon for firefox and see how it fairs. I used it in the past. I thought it was good. I personally had it with google images and the trojans that are hidden behind those images. And NO I wasn't searching naked pictures and such. :) Even if you look for household things like pictures of blenders…