| Release Date | March 19, 2019 |
|---|---|
| Release Owner | Liz Henry |
| Corresponding ESR release | 60.6.0 |
| Nightly cycle length | 7 weeks |
| Beta cycle length | 7 weeks |
| Bugs fixed in nightly | 2554 |
| Uplifts in Beta | 324 (1 backout) |
| Uplifts in RC | 13 (0 backouts) |
| Total number of uplifts | 337 |
| Betas | 12 |
| Release Candidates | 3 |
| Dot releases | 5 |
| Release notes | Consumer notes ⁘ Developer notes |
| Key Milestones | |
|---|---|
| Nightly start | December 11 |
| Beta start | January 22 |
| 66.0 | March 19 |
| 66.0.1 | March 22 |
| 66.0.2 | March 27 |
| 66.0.3 | April 10 |
| 66.0.4 | May 5 |
| 66.0.5 | May 7 |