This would be done by [[Built-in themes in Firefox - alternative to complete themes|changing your Firefox theme]] to Dark. This will make the Firefox interface dark (expect for menus generated by your operating system). Hope this helps.

''ToDinner [[#question-1263264|said]]'' <blockquote> When I open a new tab and I want to use the layout for Firefox Home but I don't want to go BLIND I would love an option to just click in settings Firefox Home Dark for new tabs. K thx, when!? PS. I already got a dark mode extension for all the other sites, it's just Firefox default page that doesn't want to work and honestly I don't understand why it's not just a drop-down menu option. </blockquote> Here's the solution: https://stackoverflow.com/questions/57521737 ~ Before: https://i.stack.imgur.com/TxRuK.png ~ After: https://i.stack.imgur.com/K0HOs.png Enjoy.