Sometimes I wonder if Chrome and Mozilla could standardize on some DevTool APIs, like JVMs standardized on JVMTI/JPDA, so that a portion of the code could be shared and people could build JS dev-tooling that would work with either browser.

Obviously, there's lots of stuff that is tied to internals, especially when it comes to profiling and native code bindings, but it seems like something could be done.

A good start would be for JS VMs to adopt a standard debugger protocol so that attaching a tool to the JS debugger would be browser independent.