Option 1: Easy Copy Add-on (Recommended)

Firefox 4 support

The Firefox Easy Copy add-on extension by Byron (new window) can be used to quickly copy the HTML source of a web page (generated from the current state of the DOM) to the clipboard by selecting its Easy Copy->HTML Source menu option. When the document source is copied to the clipboard, CSE HTML Validator can automatically detect it, paste the clipboard text into a new document, and validate it.



Option 2: Html Validator Add-on with CSE HTML Validator Support

information item Unfortunately this add-on has problems with current versions of Firefox and CSE HTML Validator and no longer appears to be under development. Consider using the integrated web browser in CSE HTML Validator instead. It allows you to browse the web while validating the HTML source.

The Firefox Html Validator add-on extension by Marc Gueury (new window) supports recent versions of CSE HTML Validator (v10.02 or greater, any edition). In the Html Validator add-on's options dialog, choose CSE HTML Validator for the Algorithm (highlighted in the screen shot). View the page source to see the validation results.

Select CSE HTML Validator for the Algorithm in the Options dialog