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Random User-Agent - Automatically change the user agent after specified period of time to a randomly selected one, thus...
HTML Validator - HTML Validator is a Mozilla extension that adds HTML validation inside Firefox and Mozilla.
30 Seconds of Knowledge - Become a better developer, in every new tab.
W3C Markup Validation Service - Validates HTML markup of web pages, one at a time.
User-Agent Switcher and Manager - spoofs browser's User-Agent string.
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.