You need to download Firefox to install this add-on.
One Click Validator. Provides you a button to validate a page using a validator like w3c or another user defined
If you think this add-on violates Mozilla's add-on policies or has security or privacy issues, please report these issues to Mozilla using this form.
Please don't use this form to report bugs or request add-on features; this report will be sent to Mozilla and not to the add-on developer.