This extension will download all pictures in the background and after a while it has downloaded over 15000 pictures and Firefox was using more than 8GB of memory and was almost not responding when i tried to Exit. So search deep 3 will make your computer to work and it will probably use all your resources too. It also seems to leave all the downloaded cache files instead of removing them when you close the extension. It will also start at search deep 3 it i have used that in a previous page and before you have changed it, it has already downloaded hundreds of pictures that will take up a lot of space. Even if i pressed Stop it continued to download pictures and i even closed the window but it continues to download. Try search deep 3 on kuvaton.com and you will see what i mean.