How to Download All Images from a Webpage in Firefox

Nowadays everyone download a lots of images. General practice is that we right click on the image and do Save Image As. This is acceptable if you are doing it for single image occasionally. But if you have to download several images from a webpage then it is a very laborious option. Basically we go for some add-ons to do this job. But it is necessary that the add-on does not save unwanted