1. Added a time picker user interface to

<input type="time">

and

<input type="datetime-local">,

making selecting a time more accessible and intuitive.

2. The JSON Viewer now shows a breadcrumb path at the bottom for the selected entry.

3. Performing a hard reload on a page (holding Shift while clicking the Refresh button) now also clears and updates its cached favicons.

4. Firefox's Local Network Access protections now extends to WebSocket connections. Websites that try to open a WebSocket to a device on your local network will now ask for your permission first

5. Firefox now supports the sibling-index() and sibling-count() CSS functions. These functions allow an element to be styled with calculations that use its index among its siblings and its total count of siblings (including itself), respectively.

6. Added support for the No-Vary-Search HTTP response header for the HTTP disk cache. Servers can now declare which URL query parameters are irrelevant to the response, allowing Firefox to reuse cached resources across parameter variations and improving cache hit rates.