How to save images from forum thread

I am trying to save all the images from a web forum thread. This thread has around 275 pages which contains more than 4000 images. Like this i have 20 or 25 threads with lot of pages. How can i save all the images from all the pages of one thread in a single click or with very minimum work. I used few add ons. I am using firefox and chrome. but no luck. Please help me to find a way to achieve this.

Thanks, Kumar.