HTML Validator - HTML Validator is a Mozilla extension that adds HTML validation inside Firefox and Mozilla.
Image2Emoji - Turn any image into a collage of emojis
W3C Markup Validation Service - Validates HTML markup of web pages, one at a time.
Emoji Art - Copy and paste beautiful emoji art 🎨
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.
Mailoji - Emoji email addresses for everyone