Reddit Enhancement Suite is one of the first addons I install when setting up any browser. It is one of those addons you don't know you need until you start using it.
My favorite feature in RES is the "never ending Reddit" feature. I can infinitely scroll Reddit without having to deal with pages. Does Reddit even have pages anymore? I don't know, because I always use RES.
Unfortunately, it is not available officially for Pale Moon. That said, Pale Moon forum member "JustOff" has hacked together a fixed version of Reddit Enhancement Suite which you can find here:
To install it, click the "Download" button corresponding to the addon you want (Reddit Enhancement Suite in this case) in the "Fix for PM27" column.
I tested this version, and it works as expected.
Thank you JustOff!