A roadmap like this?: https://wiki.mozilla.org/Platform/Roadmap Curious why you want one though?
For an automation API, would the RemoteDebug APIs³ work, or perhaps the command-line⁴ API for Firefox? See node-firefox⁵ for an example of using the RemoteDebug API to automate some functions in Firefox.
What makes you perceive the V8 team as more committed than other teams?
You can use your GitHub login to sign in to Mozilla's Bugzilla⁶, is that not enough of an integration for you?
1: https://addons.mozilla.org/en-us/firefox/addon/fromwheretowh...
2: https://addons.mozilla.org/en-us/firefox/addon/session-histo...
3: https://kenneth.io/blog/2015/03/12/remotedebug-one-year-late...
4: https://developer.mozilla.org/en-US/docs/Mozilla/Command_Lin...