It's a huge improvement to the dark theme on X (since X removed the dim-theme), but it does not work properly when creating images with Grok or adjusting images in your X-post. In both instances, the image doesn't show up until you disable this extension.
Also not everything gets colored in the blueish grey. For example: when replying to a post only the text field is dim, the original message in the background is black.
I've send the creator of this extension a message about this, but never got any reply.
So nice, but only does partially what it promises.

Works a lot better on X than DarkReader does. For the moment, at least. I'll test this extension for a few days to see if the same glitches will appear. If they do, I'll edit this review.

You are a saviour. My eyes and my mental health are thanking you.