Makes Facebook behave strangely when in night mode...but Facebook is changing and will have its own night mode option so I guess it's moot.

Very slow on large pages.

I think this add-on is already pretty much appreciated, but I think there should be some things that can be done to improve, for example, the adjustment of light and shade to adjust the color. Believe that you can cater to more pages.

Thank you for your efforts.