There is an article linked in the release notes that allows users to opt-in to a less secure option.

https://blog.mozilla.org/security/2024/06/05/firefox-will-up...

I'd say the website was already broken. I'd rather block content than have insecure resources fetched with a potentially sensitive referrer. That is, I don't want `https://example.com/why-does-my-butt-hurt` to fetch `http://media.example.com/spacer.gif` over the coffee shop's open wi-fi.

Very solid point and why it matters. I wonder if other browsers are or will do the same.