Sorry about that. Try this" How do I change dark and light mode on YouTube?
Dark theme allows you to tone down your screen's glare and experience YouTube with a dark background. Click your profile picture . Click Appearance . Select "Dark theme" to use the dark theme setting."

Let me know if that works for you!

I am glad you like this theme, algeraic. I have nothing to do with the home page color. Check to see if you have a setting in your Firefox to change it to white.

😍 Thanks so much for the 5 stars. Happy you like it.

😊 Thanks so much. I really appreciate the e5 stars.