- Firefox 127 now allows users to set the browser to automatically launch when starting or restarting a Windows computer.
- DNS prefetching for HTTPS documents has been optimized and enabled via the rel="dns-prefetch" link hint.
- Users can now close all duplicate tabs in a window with the Close duplicate tabs command.
- Firefox will automatically try to upgrade img, audio, and video elements from HTTP to HTTPS if embedded within an HTTPS page.
- A device sign-in can be required when accessing and filling stored passwords in the Firefox Password Manager.
- The CPU architecture for 32-bit x86 Linux will now be reported as x86_64 in Firefox's User-Agent string.
- Links and focusable elements are now tab-navigable by default on macOS.
- The Screenshots feature in Firefox has been updated to support taking screenshots of various file types and about: pages, as well as implementing new keyboard shortcuts and performance improvements for capturing large screenshots.