[hcs]

Developer Edition is essentially Beta with a few changes (which means additional telemetry by default so probably not up your alley):

https://hacks.mozilla.org/2017/04/simplifying-firefox-releas... (edit for better link)

[mehrdadn]

Yeah, I neither want beta nor telemetry...

[hcs]

fwiw even Nightly is quite stable these days, I can't remember when it last kept me from getting work done. And the addt'l telemetry is just a pref away.