Wonderful extension! Working perfect on almost all the websites.

Just a curious notable exception : on Amazon it slows down drastically the progressive display of the pages while I don't encounter this issue using darkreader (other excellent extension but less flexible). So I use both, depending on whether I'm on Amazon or elsewhere.

Could you see what could be the cause in Midnight Lizard's code?

Midnight Lizard will largely be the best with that optimization of the execution speed on such very popular websites with lots of elements.

Thanks!

[EDIT 2019-05-30]
Great!
Thank you Pavel !
The page you've linked (just below) is very smart with its descriptive screenshots coming with the text. I'm going to make experiments with the advices it contains.

About the other similar extensions (darkreader in my case) no, there is no risk... for the moment I use them both as if it were with a switch button: always only one enabled in the FF add-ons page (as a kind of logical XOR gate in mind).

Thanks a lot for your answer!