Is distribution the only problem? If Mozilla or Google were to make their code freely available on some git forge like GitHub and I cloned the repo and built it myself, would I be able to run it for seven days or something in the US?
nope, one can't get the entitlement -- even just for 7 days dev mode -- just like that.
Dev mode packages are self-signed, aren't they?
Unless it can be distributed it's not worth Mozilla or Google's time to bother developing support.
> If Mozilla or Google were to make their code freely available on some git forge like GitHub