It’s effectively an alpha build of the next version of Firefox – more stable than the nightly builds produced for developers, but still a long way off the relative stability of beta versions, never mind a final release. Chrome currently has three versions of its browser available: Stable, Beta and Dev, and Mozilla is copying this approach.įirefox Developer is the equivalent of Chrome’s cutting-edge Dev, which means it’s definitely not for the average user. Mozilla’s recent decision to change the way it releases future versions of Firefox has meant it needs to follow a similar development pattern to Google Chrome.