Firefox Nightly
Release Notes

Launched Windows support for WebVR, bringing immersive experiences to the web. See examples and try working demos at Mozilla VR.

Simplified installation process with a streamlined Windows stub installer

• Firefox for Windows 64-bit is now installed by default on 64-bit systems with at least 2GB of RAM
• Full installers with advanced installation options are still available

Updated Sidebar for bookmarks, history, and synced tabs so it can appear at the right edge of the window as well as the left

Pages can be simplified before printing from within Print Preview

Updated Firefox for OSX and macOS to allow users to assign custom keyboard shortcuts to Firefox menu items via System Preferences

All locales are now available for Nightly

Browsing sessions with a high number of tabs are now restored in an instant

The Photon project aiming at refreshing the user interface started being implemented in Nightly. These changes are only visible on the nightly channel and will not land in the beta and release channels before at least version 57.

Fine-tune your browser performance from the Preferences/Options page.

Make screenshots of webpages, and save them locally or upload them to the cloud. This feature will undergo A/B testing and will not be visible for some users.

Search suggestions are now enabled by default for users who haven't explicitly opted-out

Modernized application update UI to be less intrusive and more aligned with the rest of the browser. Only users who have not restarted their browser 8 days after downloading an update or users who opted out of automatic updates will see this change.

The default font for Japanese text is now Meiryo

Firefox does not support downgrades, even though this may have worked in past versions. Users who install Firefox 55+ and later downgrade to an earlier version may experience issues with Firefox.

Firefox uses Mozilla Location Service for geolocation

about:preferences has been cleaned up and reorganized to make it easier for you to find what you need

Made the Adobe Flash plugin click-to-activate by default and allowed only on http:// and https:// URL schemes. (This change will not be visible to all users immediately. For more information see the Firefox plugin roadmap)

Sites that don’t use SSL can no longer access Geolocation APIs to determine a user’s physical location