Perhaps what we need is something like CJSR (Common JavaScript Runtime). Languages that compile to JavaScript generate standardized debugging information as JSO

Perhaps what we need is something like CJSR (Common JavaScript Runtime). Languages that compile to JavaScript generate standardized debugging information as JSON (CoffeeScript has been pushing for this). These languages can then use a shared set of in-browser debugging tools (JSDB?). The fact that Safari, Chrome, and FF all support common browser extension architectures as this makes this solution even more compelling. Agressive source transformation becomes less of an issue.