I'm not understanding how to apply the dark mode using this extension. I see that it has it in the "Custom CSS" field, but what then needs to be done to apply the CSS? This is probably really obvious to most of the userbase, but I'm pretty inept when it comes to anything pertaining to web design.
Also, the text in the extension is nigh unreadable. I have to highlight it all to get enough contrast to make it visible. This is on Firefox, anyone else have this issue?