I have added it to my fork of the script at https://openuserjs.org/scripts/anka-213/Webcomic_Reader
I have added those to my fork of this script: https://openuserjs.org/scripts/anka-213/Webcomic_Reader
The fix was far from trivial, so you should not feel dumb. I have fixed it in a fork of the script available at: https://github.com/anka-213/webcomic_reader/raw/master/webcomic_reader.user.js.
I have added feywinds.com in a fork of the script available at: https://github.com/anka-213/webcomic_reader/raw/master/webcomic_reader.user.js.
The site seems to be down now. Anyways, amibode hasn't responded for over a year, so I made a fork of the project, which is actually being updated: https://openuserjs.org/scripts/anka-213/Webcomic_Reader (See also issue tracker at https://github.com/anka-213/webcomic_reader/issues)