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> I haven’t noticed any difference with web content either, but I also use Firefox / Chrome instead of Safari

Lockdown mode only affects Safari. If you use another browser, it doesn't make any difference.

Here are some features that are disabled in Safari when lockdown mode is enabled:

- JIT

- Remote fonts

- WebAssembly

- WebGL

- WebRTC

- PDF Viewer

- MP3 Playback

- Gamepad API

- Web Audio API

- Speech Recognition API

- MathML

- JPEG 2000

- MediaDevices.getUserMedia()

You can configure most of those in Firefox and Chrome, but it has to be done manually and cannot be disabled easily on a per-site basis like in Safari.



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