NOW USELESS ........
unfortunately, besides the fact that it really slows down all browser pages loading as mentioned by many users ....an even WORSE issue (which the developer refuses to respond to as i have messaged him directly over the past 2 months) is the FACT that one can no longer even SEE THE Scroll-bar on any given page ...it is so faint as to be virtually invisible (i actually had to use a magnifying glass to find the scroll-bar or scroll-button on every browser page) ...rendering Dark Reader Impractical and frankly USELESS. i have now switched over to Midnight Lizard, which has much better control and NO scroll-bar issues, can see the scroll-bar & scroll buttons perfectly using Midnight Lizard.