Summary: As part of increasing readiness to ship Mixed Content Level 2,
we’re enabling the flag to upgrade some passive mixed content in Nightly
only. Previously this would result in the mixed content indicator. Loads of
type image, audio, and video will be upgraded by rewriting the URL from
http: to secure transport using https:. As specified, there will be no
fallback if the resource is not available over HTTPS.

We will keep this in Nightly for a couple of cycles, before we let it ride
the trains.

Bug: <https://bugzilla.mozilla.org/show_bug.cgi?id=1633743>
https://bugzilla.mozilla.org/show_bug.cgi?id=1672106

Standard: <https://w3c.github.io/webappsec-mixed-content/level2.html>
https://www.w3.org/TR/mixed-content/

Platform coverage: All

Preference: security.mixed_content.upgrade_display_content

Our standards position:
https://mozilla.github.io/standards-positions/#mixed-content

Devtools bug: N/A. We already log to the console.

Other browsers: Chrome has been shipping that behavior since Chrome 81; no
public signal from Apple.

web-platform-tests: Exist at mixed-content/tentative/autoupgrades


Intent to prototype was at
https://groups.google.com/g/mozilla.dev.platform/c/F163Jz32oYY

Best regards,
Tomer, Freddy and Christoph

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