So, FireFox has a built-in "dark theme". But at the moment, I think it is not finished. The fact is that, with the "dark theme" enabled, the background of the FF service pages (for example: "Blank Page", "Preferences") are white. In this regard, my question is, will this be fixed in future releases?

The second question is about "dark themes" on web sites. Web developers have finally figured out how to present their site in a user-defined color theme. For example - Youtube. If I open a Youtube page not with FireFox, it will define a "device theme" and show the page not in "white" but in "dark" version. It is very comfortable. Unfortunately, it doesn't work in FF. Can FireFox be taught to tell the site the color theme of the device?