From Planned downtime 17 an 18 December (https://forum.palemoon.org/viewtopic.php?f=17&t=32966):
QuoteOur server provider has infomed us of 2 upcoming maintenance windows which will impact our services and websites.
First window starts 17th December at 08:30 UTC / 09:30 CET. Expected downtime approximately 2 hours.
Second window starts 18th December at 08:30 UTC / 09:30 CET. Expected downtime approximately 2 hours.
This will affect various sites and services. Notably the primary public DNS resolver and time services will not be interrupted.
Update for clarity.
The first window impacts automatic updates, dynamic user agent updates, the forum, the european download mirror and the test server.
The second window impacts captive portal detection, the main website and developer website, the secondary anonymous public DNS resolver, default start page redirect, and several other low priority informational pages (e.g. internal help from the browser UI)