Then you educate yourself on those versions, and discover that the "dev" edition is not a prerelease version at all, unlike beta and nightly, which are. The Dev

Then you educate yourself on those versions, and discover that the "dev" edition is not a prerelease version at all, unlike beta and nightly, which are. The Dev edition is a version of the main release channel with flags turned on/off to enable all the "only powerusers need these things" functionality out of the box. Like installing whatever extension you want directly from file.