Greasy Fork is available in English.
Enable next / previous chapter on right / left arrow keys on Sloth Translations Blog.
Navigate chapters on Sloth Translations Blog using the left and right arrows on your keyboard. Left is previous chapter, right is next chapter.
Developed in Tampermonkey v4.11.6120 using Firefox 84.0 (64-bit) on Windows 10 Pro.
I sometimes make dark CSS themes and JS userscripts. Some of them aren't terrible.