Firefox Home (the default New Tab) now allows users to display up to 4 rows of top sites, Pocket stories, and highlights

“Reopen in Container” tab menu option appears for users with Containers that lets them choose to reopen a tab in a different container

In advance of removing all trust for Symantec-issued certificates in Firefox 63, a preference was added that allows users to distrust certificates issued by Symantec. To use this preference, go to about:config in the address bar and set the preference "security.pki.distrust_ca_policy" to 2.

Added FreeBSD support for WebAuthn

Improved graphics rendering for Windows users without accelerated hardware using Parallel-Off-Main-Thread Painting

Support for CSS Shapes, allowing for richer web page layouts. This goes hand in hand with a brand new Shape Path Editor in the CSS inspector.

CSS Variable Fonts (OpenType Font Variations) support, which makes it possible to create beautiful typography with a single font file

Updates for enterprise environments: AutoConfig is sandboxed to the documented API by default. You

can disable the sandbox by setting the preference

general.config.sandbox_enabled to false. Our long term plan is to

remove the ability to turn off the sandboxing. If you need to

continue to use more complex AutoConfig scripts, you will need to use

Firefox Extended Support Release (ESR).