The preference is being removed from Beta, as quoted above. Nightly is just not a great answer for a "power user".

I'm already using Firefox Beta. I don't want to be using Firefox Nightly.

As others said elsewhere, mozilla will provide builds of Beta that do not have this issue. It's just that the default build will.

but i actually do work. I'm not testing new ff releases all the time. i also run Aurora for that.

now you say release/sign your extensions.... well they mostly contain internal data and URLs. no way I'm publishing any of those.

You don't need to publish extensions to get them signed, AMO will sign unlisted extensions that are submitted.

this doesn't really change the situation for enterprise users though.

Allow enterprise users to generate firefox executables with additional trusted certificates and distribute that on their machines instead of the original?

do you think people will do that, or just give up and use another browser?

then with everyone developing exclusively in chrome, any bug in firefox will be ignored as everyone adds a note to their support staff to 'just tell users to use chrome'