It is documented here: https://mozilla-services.readthedocs.io/en/latest/storage/apis-1.5.html https://mozilla-services.readthedocs.io/en/latest/storage/ap...

It is documented here: https://mozilla-services.readthedocs.io/en/latest/storage/apis-1.5.html https://mozilla-services.readthedocs.io/en/latest/storage/ap... I'm not sure about the current status of this document. Years ago there were subtle nuances that I gad to reverse engineer looking at the source code and Firefox's actual behavior.