The Structured Data Testing Tool Chrome Extension solves a friction problem that anyone doing regular schema audits will recognise immediately. Instead of copying a URL, opening a separate validation tool, pasting the URL, and waiting for results, you just click a button in your browser toolbar. The extension checks the structured data on whatever page you’re currently viewing and shows you the results in a popup or sidebar, depending on the specific extension you install.
There are a few versions of this concept in the Chrome Web Store, and they vary in which underlying validator they call. Some connect to the Schema Markup Validator, others to a local parser. The best ones give you a quick visual summary of the schema types found on the page and flag any errors, which is exactly what you need when you’re moving quickly through a site audit or spot-checking pages on a client site. I find it particularly useful during content publishing workflows, checking that a new page has picked up the expected schema before signing off.
The main thing to be aware of is that browser extensions have varying levels of maintenance. Before installing, check the last update date and the reviews to confirm the extension is still actively maintained and connecting to a reliable validator. The concept is excellent and the best implementations genuinely save time. If you do regular technical SEO work, having schema validation a single click away rather than a tab switch away is a quality-of-life improvement that adds up over the course of a working week.