We will have a scheduled maintenance window tonight from 6:00pm to 11:00pm PDT. The following changes will take place:

9:00pm PDT (0400 UTC) addons.mozilla.org update. We’ll be updating addons.mozilla.org to pick up code updates (bug 512892). Duration 30 minutes.
9:00pm PDT (0400 UTC) GeoDNS update. We’ll be updating pushing out code updates to our GeoDNS [...]

We will have a scheduled maintenance window tonight from 9:00pm to 11:00pm PDT. The following changes will take place:

7:00pm PDT (0200 UTC) The Amsterdam Reboot. We’ll be turning down services in Amsterdam and pulling production traffic back to San Jose in preparation for The Amsterdam Reboot next week. No user facing downtime is [...]

We will have a scheduled maintenance window tonight from 9:00pm to 11:00pm PDT. The following changes will take place:

9:00pm PDT addons.mozilla.org EV SSL certificate deployment. We’ll be replacing the wild card certificate with a GeoTrust EV SSL certificate tonight. No downtime expected.

Please let me know if you have any reason why we should [...]

(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 10:15pm to 12:15am PDT.
The following work will take place:

10:15pm PDT (0515 UTC) addons.mozilla.org database replication re-sync. We’ll be taking down the [...]

We will have a scheduled maintenance window tonight from 6:00pm to 11:00pm PDT. The following changes will take place:

6:00pm PST (0100 UTC) Kernel upgrades. We’ll be doing kernel security updates on various machines affecting the following services for approximately 10 minutes each:

sand.mozilla.org (part of irc.mozilla.org)
All RHEL-based development machines (hostnames beginning with sm-* or cm-*)
build [...]

At around 1:30pm PDT Sunday afternoon Mozilla’s primary data center in San Jose went offline.
CoreSite, Mozilla’s San Jose data center provider, indicated that they had suffered a CRAC unit failure on the 16th floor. This unit provided the majority of the cooling for Mozilla’s cage. Without it, the ambient air temperature quickly rose [...]

We will have a scheduled maintenance window tonight from 6:00pm to 11:00pm PDT. The following changes will take place:

5:00pm PDT (0000 UTC) cg-vmware01 ESX Upgrade. We’ll be updating ESX on cg-vmware01 which will affect the following VMs for 2 hours:

cg-ecmascript01
landfill
tinderbox.bugzilla
cg-centos01
windows.bugzilla
oracle.bugzilla

7:00pm PDT (0200 UTC) developer.mozilla.org/MDC update. We’ll be updating developer.mozilla.org/MDC to pick up [...]