Firefox is my browser of choice on desktop and the new mobile version is brilliant but I badly need an extension that will reverse light background websites to be dark. This is the only thing blocking me adopting it as mobile browser of choice.
Edit: Sorry, I was referring to Firefox mobile, and this is regarding Firefox preview, which I don't have any actual experience with. I'm not sure how much applies.
"With Dark Reader, websites on mobile will be easy to read when the lights are dim. The extension automatically inverts bright colors on web pages to offer an eye-pleasing dark mode. There are a number of configuration options allowing you to customize your experience."