Firefox Beta and Developer Edition
Release Notes

Increased robustness of HTTP/3 upload performance for unstable network conditions.

The TrustPanel combines the privacy and security panels accessed from the address bar to give the user one place to check the Privacy and Security settings of the current page.

Security has been strengthened by tightening the requirements for JavaScript files that can be loaded in the parent process, providing additional defense in depth against potential threats.

On Linux, Firefox will now default to the XDG portal file picker if available, rather than the GTK3 one, which is usually better integrated with the user's desktop environment, and more powerful.

Firefox error pages have a fresh new look, with updated visuals that better match the overall feel of Firefox. The redesigned pages create a more cohesive experience while making it clearer what went wrong.

On Windows, Firefox will use the modern Windows.Devices.Geolocation API for geolocation instead of Windows 7 location API.

The toolbar of the Storage Inspector now has a button to delete all entries of the currently selected storage.

Besides each CSS declaration related to a computed value shown in the Computed view there's now an icon to jump to it in the Rules view.

showPicker() now supports text-based <input> elements with an associated <datalist>, displaying the autofill dropdown. See documentation.

The functions xywh() and rect() were previously implemented for the clip-path and offset-path properties. They are now also available for the shape-outside property.

The math value of the CSS font-family is now supported and used by default for MathML's <math> element. It enables Web developers to indicate special fonts with advanced math features should be used. Firefox will rely on the serif font for mathematics defined in Firefox preferences.

Added support for the HTML attribute popover="hint".

Enabled media element pseudo-classes, such as :playing, :paused…

Enabled the spec-compliant HTMLMediaElement.captureStream() API.

Added support for closing popovers & dialogs with the Android Back Button, and implemented the CloseWatcher API for handling this in script.

The new Reporting API provides a generic reporting mechanism for web applications to use to make reports available based on various platform features (for example Content Security Policy, Permissions-Policy, or feature deprecation reports) in a consistent manner.