Uses the IP-API service instead of Google's for geolocation.
Defaults to DuckDuckGo as the search engine instead of Google or Yahoo!.
Defaults to a customizable start page in cooperation with.
These include retention of "Complete Themes", themes which apply to the entire UI of the browser rather than affecting only a few elements, support for which was removed in Firefox.
Supports add-ons exclusive to Pale Moon, including dozens of themes.
Continues add-on support for XUL, XPCOM, and NPAPI plugins, all of which are no longer supported in Firefox.
Uses the pre-Australis Firefox user interface.
Replaces the Gecko browser engine with the Goanna fork.
Always runs in single- process mode, whereas Firefox became a multi-process program.
Pale Moon has diverged from Firefox in a number of ways: