Firefox Developer
Edition

Firefox Developer Edition (was Aurora) is the rapid-fire release channel for the next iteration of the Firefox Web browser. The Developer channel is where users can test the latest features and innovations. Users can expect an increase in polish from the raw, cutting edge features in the nightly builds. These releases may not be as stable as beta or final releases.

With Firefox Developer Edition:

• Experience the newest innovations in an unstable environment that's not for the faint of heart
• Provide feedback on features and performance to help determine what makes the final release

New:

• The display language for the Firefox application UI is now changeable in the Options page
• Added support for the WebP image format
• Firefox on Windows can now be installed using an MSI installer
• Firefox now supports Handoff on macOS to continue browsing from your iOS device to your Mac
• On Linux, tabs can be switched by scrolling in the tab bar

Changed:

• Updated the Content Blocking section in the Privacy & Security Options page and in the Control Center to simplify blocking options for users
• Enhanced security for Linux, Android, and macOS users via stronger stack smashing protection being enabled by default
• Firefox can now be set to warn when exiting, even when configured to automatically restore the session on the next launch
• Memory usage is also now reported for each resource visible in the updated Task Manager page found at about:performance

Developer:

• Added a new Flexbox inspector tool to detect and highlight Flexbox containers and debug Flex items' sizes
• All CSS changes made in the Rules panel are now tracked in the new Changes tab
• Added support for the Storage Access API on desktop platforms