What is livescratchpad?

Live Scratchpad is a Firefox add-on that lets you see what your JavaScript code does as you write it. Instead of running your code, checking the output, going back to tweak something, and running it again, you get immediate feedback right in the editor. It is essentially a live, interactive workspace for experimenting with JavaScript functions. When you are editing a function, you can change the inputs and watch the results update instantly on screen. The add-on shows you not just the final output but also the intermediate steps the function goes through as it runs. If your function works with objects or web page elements, you can click on those values to dig into their properties. It also highlights which parts of your code actually executed and which branches were skipped, making it easier to understand how your logic plays out in practice. This tool is aimed at web developers and tinkerers working in Firefox, particularly those using the browser's built-in Scratchpad feature for quick JavaScript experiments. Someone debugging a tricky function, for example, could use this to see exactly where a calculation goes wrong by watching each step unfold live, rather than relying on scattered console logs. A beginner learning JavaScript might also find it useful for building intuition about how code executes, since the immediate visual feedback makes cause and effect much clearer. The project requires Firefox 11 or later and is licensed under a combination of Mozilla, GPL, and LGPL licenses. Beyond what is described in the README, it does not go into further detail about the underlying architecture or additional capabilities.