This is a new major release with a lot of changes and improvements:
Changes in this version:
Update of the underlying Firefox (gecko) code to v19. This has a number of consequences:
Add-ons and themes may need to be updated since the UI code has changed.
HTML5-implementation is more complete
A number of CSS statements have their prefix removed (-moz*)
Improvements to the layout and rendering engines
If you are using a language pack, you need to update it to the new version
Update of the browser style. Main browser controls and the padlock look slightly different.
Several Pale Moon specific improvements to the rendering engine, noticeable in general use and certain benchmarks, to prevent browser stalls or high CPU usage on certain pages.
The builds no longer use PGO (Profile Guided Optimization) but are globally speed-optimized.
Full Change log...»forum.palemoon.org/viewtopic.php?f=1&t=2081