Firefox Beta and Developer Edition
Release Notes

On Firefox for Android, fixed pages that request landscape orientation being saved as shrunken portrait pages when printing or saving to PDF.

Fixed the Windows taskbar staying visible over full-screen Firefox windows after switching back from another application.

Fixed Firefox hanging on macOS 26+ when opening Spotlight with a large number of bookmarks.

Fixed WebRTC video calls with some services sending low-resolution H.264 video since Firefox 158.

Fixed some tabs not being restored after a restart when the saved session referred to a tab group that no longer existed.

Fixed typing with an input method, such as for Japanese or Korean, stopping after the first character in Canva Docs.

Significantly improved rendering performance for backdrop-filter on certain Android devices.

On macOS, keyboard shortcuts assigned to Firefox menu items in System Settings now replace the built-in shortcuts for those items.

Browsing history imported from Chrome now includes how often you visited each page, so the sites you use most rank higher in address bar suggestions and shortcuts.

Fixed the Developer Tools eyedropper showing the wrong colors after the page is scrolled.

Firefox now supports the random() CSS function, which allows authors to introduce randomness into their styles, generating a random value in a given range (with an optional increment) that is usable anywhere that math functions can be specified. Learn more.

Firefox now supports nested arbitrary substitution functions in the primary parameters of var(), attr(), and env(); for example, var(attr(data-theme-prop type(<custom-ident>))) and env(var(--safe-area-block-start)).