In the spirit of a similar page on MDC, this page details the various "branches" and when they were made. In the case of hg, the date is when the new repository was created.
| Name | Description | Notes |
| mozilla-central | Trunk development on Firefox 134 and Gecko 2.0. | |
| mozilla-beta | Branch development on Firefox 133 and Gecko 2.0. | |
| mozilla-aurora | Branch development on Firefox 54 and Gecko 2.0. | |
| mozilla-esr60 | Branch development on Firefox ESR 60 and Gecko 2.0. | How To: Releases/Set_Up_ESR_Branch |
| mozilla-1.9.2 | Branch development on Firefox 3.6 and Gecko 1.9.2. | branch date: 2009-08-13 |
| mozilla-1.9.1 | Branch development on Firefox 3.5 and Gecko 1.9.1. | branch date: 2008-12-01 |
| HEAD (on CVS) | Branch development on Firefox 3.0 and Gecko 1.9.0. | branch date: 2008-06-01 (kinda; didn't really "branch", development moved to hg) |