Without out a doubt, one of the most helpful tools when working with any browser automation library is a visual debugger. [We've written quite a bit about it](/blog/2019/04/18/live-debugger.html). Since browserless is built specifically for developers, we're always striving to provide the best experience possible with debugging — and weren't satisfied with the state-of-the-art with the newer automation libraries. Simply put: `headless: false` isn't _quite_ enough to debug puppeteer, nor is any current live "REPL" out there.