How to Enable Dark Theme on Old Forums That Don't Support It

Old phpBB and vBulletin forums rarely have a dark theme, though some offer a dark style in your profile settings, so check there first.

If not, Modern Dark Mode doesn't need one. It flips the colors of the whole page with a CSS filter, so it works on old table layouts and inline styles just as well as on modern sites: white turns dark gray, black text light gray, and avatars and images keep their colors. Old forums often use background images for headers and buttons, which may come out inverted. The Contrast and Brightness sliders in Advanced Settings help with tiny, faint text.