I wrote a pretty long comment about the tools I use for debugging JS, but yeah, ...

I wrote a pretty long comment about the tools I use for debugging JS, but yeah, in the end the guy who's been here twice as long as me and wrote most of the system can usually debug things in a fraction of the time because he can guess what's causing a problem just from reading a description of the bug.

But I can't give that to people through a comment on HN, so I stuck to tools.