Firefox is distributed through channels: Nightly builds, the Aurora pre-release channel, a stable Beta, and the public release. This field identifies the channel.
Firefox rozdźělujo se pśez kanale: wersije Nightly, pśedpśipušćeński kanal Aurora, stabilna beta-wersija a zjawne pśipušćenje. Toś to pólo identificěrujo kanal.