You will need to install a user script manager extension to install this script.
The script you will find here is completely functional in its current state, however I'll not be updating it here anymore, so if you are interested in future updates, please install from my Github
Adds endless / infinite scroll function to Gelbooru. Designed to work with Gelbooru Image Viewer
You can press any key now to kickstart loading the first page now in case, for whatever reason, you get a list that's too small to scroll your screen and it gets stuck.