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The Download Now link will prompt a local download of the Firefox extension. To install the extension directly, open the file using your Firefox browser.

Editors' Review

by   / February 27, 2009

This valuable freeware tool allows Web developers to check their Web pages for HTML errors. HTML Validator adds an unobtrusive icon in the right-hand corner of your Firefox window.

Hovering your mouse over the icon reveals errors and warnings for the page. Double-clicking the icon introduces a detailed window with the current Web page's lines of code, along with the errors and warnings found. The Options menu allows you to check the HTML page locally using different algorithms. A handy Help key explains what each symbol means, and novice users will appreciate the shortcut button to Htmlpedia. HTML Validator provided detailed error information for each Web page we checked. And using the Clean Up functionality, we were able to apply quick fixes to the code.

HTML Validator's straightforward design and effective presentation make it an easy tool to recommend for any Web developer, or those just interested in code.

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Full Specifications


Publisher Marc Gueury
Publisher web site
Release Date December 19, 2011
Date Added December 19, 2011


Category Browsers
Subcategory Firefox Add-ons & Plugins

Operating Systems

Operating Systems Windows XP/Vista/7
Additional Requirements Firefox 5.0 - 9.0

Download Information

File Size 2.06MB
File Name External File


Total Downloads 1,347
Downloads Last Week 1


License Model Free
Limitations Not available
Price Free
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