-Edit-
Updated to 5 stars on account of me being dumb. Great work, Alex :)

I had found that there are sometimes issues with some random websites not loading / rendering correctly with Dark Reader enabled.

This is to be expected, since the way sites are coded & styled varies, sometimes a lot.

Fortunately, this extension DOES give you a user interface for dealing with such situations.

Hit the 3-dot button to display the general Firefox menu, and then scroll down to the Dark Reader option to access this extension's nicely built UI.

This allows you to disable the extension on a site-by-site / per-URL basis, making it the perfect companion for anybody with sensitive eyes.