We will have a scheduled maintenance window tonight from 7:00pm to 11:00pm PST. This is being tracked in master bug 464743. The following changes will take place:

7:00pm PST (0300 UTC) support.mozilla.com updates. We’ll be updating support.mozilla.com to pick up code updates. No downtime is expected.
7:00pm PST (0300 UTC) Root-level DNS changes.  We will [...]

(Apologies for the short notice.  We generally want to stick to our normal advertised maintenance windows but sometimes technology works against us.)
We will have an emergency maintenance window tonight from 6pm to 11:00pm PST.
The following work will take place:

6:00pm PST (0200 UTC) ) EqualLogic storage array firmware upgrade.  See bug 464458 for details.  We’ll [...]