FAQ Has the Webextension version of HTML Validator the same features than the original Firefox version: See roadmap. Issues Known issues: https://gitlab.com/mgueury/html_validator/issues User Guide Content 1. How to use the HTML validator for Firefox 2. Tidy vs SGML parser 3. Validate now ( after JavaScript or AJAX execution ) 4. Icons 5. Customize toolbar: How to change the place of the HTML Vali