In the Queries docs, there is a Browser Extension section linking to a Chrome extension for Testing Playground. That Chrome Extension is no longer supported and shows the following message:

"This extension is no longer available because it doesn't follow best practices for Chrome extensions."

Since the docs already mention testing-playground.com in the Playground section, I think the simplest fix would be to remove the Browser Extension section entirely.

I'd be happy to submit a PR to remove it if that sounds good. (This would also be my first contribution 🙂).