Probably the best but makes firefox load pages about 2-3 seconds slower:/

saves my eyes from straining, thank you very much :-*

Absolute hands down the best add-on to night-mode-ify the web.
BUT
It renders Firefox unbelievably slow.

Slows down FF dramatically. Also, the new tab window is still burning-the-eyes white.

This is the first add-on I have found that makes Facebook dark WITHOUT ruining other elements of it. It looks naturally dark as the website intended it.