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I think the big difference since the recent threads is the news that Apple is adding support for JPEG XL to Safari.

For HEIC, I understand, but it's weird that they are the only ones supporting JPEG XL while it is a royalty free open standard and the open source browsers don't support it.

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WebKit (Safari's rendering engine) is open source. WebKit is a fork of KHTML and Blink (Chromium's rendering engine) is a fork of WebKit.

I am aware, but note that Safari relies on ImageIO for image decoding and AVFoundation for video decoding, two components of the proprietary OS. Chrome and Firefox on the other hand ship a lot of their own decoders. Those parts are not open source (nor is the GUI, while Chrome is open source also from the GUI point of view, it's really just a bunch of google-custom modifications/extensions that are closed).

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