there used to be a website - arewemobileyet.com which listed the API's that we identified as necessary to make FxOS possible.
You can find it in web.archive - http://web.archive.org/web/20140401194921/http://arewemobile...
We successfully standardized most of them! :)
Next time you want to spread theories and rumors, check background of who you are questioning ;)
Source: I work at Mozilla and on Firefox OS project.