Post Syndicated from corbet original https://lwn.net/Articles/977973/

Version
127.0 of the Firefox browser is out. Changes include support for DNS
prefetching and the ability to close duplicate tabs in a window. The
browser will now try to upgrade images and videos with HTTP URLs that are
found in an HTTPS page to HTTPS as well; if that fails, the non-HTTPS
resources will simply fail to load.

Update: this
Mozilla Secuirty Blog post describes the HTTPS-related changes in
detail.