Which ECMA edition mozjs obey?

I’d like to know which ECMA edition do the two versions about mozjs(mozjs-52.9.1, mozjs-1.7) obey?

hello @Jim_Ryna

not sure if i got your right but would that help you
https://caniuse.com/#search=ECMA

and does not mean that certain browser enable some feature that mean it implement all the value and options

use the site i mentioned and also the mdn to look for the value /option / property you want and see if it enable on your browser

hope that help and have a nice day