If you're browsing qresearch with Tor (or older Firefox), you can add DownThemAll and configure the following filter to pull down all the large size images of a given thread. (Ctrl-S will save the page, but it only captures the smaller size images. This gets the larger ones too.)

/^(?!.+\/(\d{10})-?[1-9]?..+).+(file_dl\/.+(jpg|png|jpeg|gif)\/)/i

pics related