Go beyond console.log with the Firefox Debugger

console.log is no debugger. It’s great for figuring out what your JavaScript app is up to, but it’s limited to spitting out a minimal amount of information. If your code is complex, you’ll need a proper debugger. That’s why we’ve added a new section to the Firefox Devtools Playground that’s all about debugging, with four basic lessons that use the Firefox Debugger to examine and repair a simple JavaScript to-do app.

Link: https://hacks.mozilla.org/2017/11/go-beyond-console-log-with-the-firefox-debugger/