“The reason is that I did not provide an exact link to the origin of the hsluv-0.1.0.min.js library used by uBO to implement dark theme (uBO’s About page does credit the author of the library).”
The best ad blocker on the internet got bounced from Mozilla’s store over a missing link to a color library. The release still ships for Chrome and Edge. Mozilla needs uBlock Origin more than uBlock Origin needs Mozilla. Its review team acts like it’s the other way around.