Have used this for a number of years. Have been very happy with it! It's quite impressive at getting the colourscheme perfect. It can make some websites a littly bit laggy, so sometimes I will disable it. It's not a big deal, and if it was a big deal, I wouldn't have continued to use it.

I hate when my screen is white.

It's a very useful addon for people who like dark mode. Of course, occasionally it can make a site look ugly or accidentally color-invert images, but it happens surprisingly less often than expected for something like this. So, I'll still give it 5 stars, rather than 4.