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1. HTML Validator
Html Validator adds a small icon to the status bar which instantly validates the code as the page loads. The extension is based on HTML Tidy originally developed by W3C but then enhanced by other people. The algorithm is embedded inside Firefox and makes the validation locally on your machine, without sending HTML to a third party server.
2. Total Validator
Total Validator is a FireFox plugin that uses the official W3C and ISO DTDs for HTML Validation. The plugin works via the icon in the status bar which, when clicked, opens a new tab with the detailed validation report.
3. Validaty
Validaty works via a tab in the toolbar, once clicked it evaluates the current page and turns either green if the code is fine or red when errors are found.