The stage setting sounds a little too grim- JS debuggers (Venkman etc) and smartphones existed in 2005, and people haven't stopped using editors like vi or textmate to write code.
It is true that there were some desktop debugging tools (i remember a js debugger for IE6), but it was difficult to set up, and nothing like firebug or chrome dev tools. Live DOM inspection and editing didn’t exist.
Despite the lack of tooling and the horrors of IE6 I still feel that was a golden age in web dev. It was a time of wild experimentation, where a single js dev could gain global notoriety by creating a cool hack or a nice library.