HTML Validator extension for Firefox

The “HTML Validator extension for Firefox”:http://update.mozilla.org/extensions/moreinfo.php?id=249&vid=716 is based on the “W3C Tidy engine”:http://www.w3.org/People/Raggett/tidy/ and provides a validation report at the bottom of the View Source window in “Firefox 0.93+”:http://www.mozilla.org/products/firefox/. It will even attempt to clean the HTML for you and show you the cleaned version of the page.

“Get it now!“:http://update.mozilla.org/extensions/moreinfo.php?id=249&vid=716