I don't have huge problems stepping through code in browsers (source maps, async/await, blackboxing helps a lot), and when I do, I just resort to console.debug

I don't have huge problems stepping through code in browsers (source maps, async/await, blackboxing helps a lot), and when I do, I just resort to console.debug logging, but what I would like to know is why Firefox' source map support (at least when using Webpack) still is so terrible? And why is it OK in the Developer Edition of the browser? Why have two different implementations? Is Mozilla intentionally hobbling the regular edition of the browser to justify the existence of the Developer version (because other than the source map support, I don't see the point of the Developer version)? And then people complain about developers only testing in Chrome, well...