- Release Channel (default)
- Beta Channel
- Firefox Developer Edition (Aurora) Channel
- Nightly Channel
Which channel you are in is determined by the app.update.channel pref, which will be typically set to ‘release’, ‘beta’, ‘aurora’ and ‘nightly’. This setting is passed along in the software update URL.
See Software_Update:Checking_For_Updates and Software_Update:Nightly_update_infrastructure for more information on the update URL.