As written by GinkgoWerkstatt (https://www.deviantart.com/ginkgowerkstatt) in the Guide to the deviantART Related Gallery, The browser scripts and extensions category is for scripts that add new functions to (or modify current functions of) deviantART.com. Commonly these scripts are installed through Greasemonkey, but some are designed to install through web browsers such as Mozilla Firefox. Keep in mind that this category is for functioning scripts, not just ideas for scripts.
This is perhaps one of the most resourceful types of dA Related deviations :dummy: But, how do you create these? In order to find out, I interviewed a couple of creators of scripts, user styles and apps. :eage