Version 2.0 — a complete rebuild.

New
• A new dark-mode engine. Photos, videos and image backgrounds keep their real colours, and coloured buttons and panels keep their hue instead of turning grey.
• No more white flash: pages are dark from the first frame.
• Sites that already have their own dark theme are detected and left alone. You can still force dark mode on any site.
• Brightness, contrast and sepia sliders, applied live to every open tab.
• Optional: only darken pages while your system is in dark mode.
• Keyboard shortcut Alt+Shift+D turns dark mode on or off for the current site.
• Redesigned popup: one switch for the current site, a clearer "Everywhere, except…" / "Only on…" choice, inline validation, undo when you remove a site, and you can paste a full link to add its site.
• Changes apply instantly to all open tabs, no reload needed.

Improved
• Much faster on large pages: style work on a 4,000-row page went from about 550 ms to about 30 ms.
• Site patterns are stricter: *.example.com now matches example.com and its subdomains, and no longer matches notexample.com.
• Better keyboard and screen-reader support in the popup.
• Nothing is saved from private windows.

Now requires Firefox 140 or later (Firefox for Android 142 or later).