I have two problems with Dark Reader. (1) When I change to a new tab or new content for a tab I typically get a bright white initial display before Dark Reader kicks in to style the new content, completely dazzling my dark-adapted eyes and obviating the point of the extension and (2) Critical content is often unreadable using Dark Reader. I'm guessing that the first problem is not easy to address given the self-imposed limitations of FF's new extension mechanism!

if you listen to me you should download it

This add-on sometimes works like a charm, but often breaks webpages, making them unusable whether or not I toggle the add-on on or off entirely or for single websites. The add-on often makes necessary navigation text and links unreadable/invisible. Also, removing the add-on does not remove the CSS from these pages, I probably need to empty my caches.