molokai VS stylebot

Monokai was the name of the blog where the colorscheme was originally posted to: https://web.archive.org/web/20161107090516/http://www.monoka...

At some point, the original author decided Monokai was a good name for both the website and the colorscheme: https://monokai.pro/

A different author ported the theme to Vim, and named this version Molokai to avoid confusion with the original author: https://github.com/tomasr/molokai

First, the tutorial is simply giving you bad advices. You should not be placing custom color schemes in ~/.vim/colors. You should instead be installing it like a plugin instead. Color schemes are just a type of plugins that only have a color folder (e.g. if you look at https://github.com/tomasr/molokai it only has a "color" folder and licenses etc).

In any case, this seems to be little more than a slightly modified version the molokai color scheme, which is a much more normal looking repo.

Vim theme: molokai

You can also do this with the Stylebot extension - https://github.com/ankit/stylebot .. I was already doing this :) (just copy paste the CSS)

I customize fonts/colors on a per-site basis with Stylebot.

With Stylebot for example

You only need to install Stylebot in your browser, copy the code within the extension (restore Backup option) and change the instance domain.