The process for getting Dark Reader varies slightly depending on your browser, but it is generally a one-click installation from official extension stores. Dark Reader - Chrome Web Store

The Dark Reader extension is a highly popular, open-source eye-care tool designed to enable a "dark mode" for every website you visit. Unlike simple themes that only change the browser's interface, Dark Reader dynamically inverts bright colors and adjusts website contrast to create high-quality dark themes on the fly. It is widely trusted by over 10 million users and is available as a free download for most major desktop browsers.