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W3C Markup Validation Service - Validates HTML markup of web pages, one at a time.
Dark Reader - Reduce eye strain in your browser with this extension that provides a dark theme for browsing.
HTML Validator - HTML Validator is a Mozilla extension that adds HTML validation inside Firefox and Mozilla.
Night Eye - Night Eye is a browser extension that enables dark mode on any website you visit. It does not ruin your browsing experience by simply inverting images.
Rocket Validator - Site-wide Accessibility and HTML validation made easy. With a single click, Rocket Validator will check thousands of web pages on your site for Accessibility and HTML conformance, producing a detailed, actionable report on seconds.
Dark Mode - A global dark theme for the web