![]() This is likely in response to past FaceTime bugs, such as the exploit in 2019 which allowed an attacker to listen in on your microphone before you picked up the call. FaceTime: Incoming calls are blocked, unless you have previously called that person or contact.This includes most iMessage "apps" such as in-conversation games. Messages: Most message attachments are blocked, besides certain image, video, and audio attachments.Lockdown Mode also changes the way a number of different Apple services are used on your device. If you encounter a trusted website which breaks with Lockdown Mode enabled, you can easily add an exception for that website while keeping the rest of Lockdown Mode's protections intact. Luckily, Lockdown Mode can be disabled on a per-site basis on Safari, so none of these issues should prevent you from enabling Lockdown Mode on your device. This notably breaks a lot of icons on various websites, which are often replaced by an empty square. Additionally, many other external web fonts are disabled, limiting websites to only the fonts pre-installed on the device. Other technologies that were disabled include WebGL, MathML, Gamepad API, Web Audio API, RTCDataChannel, and SVG Fonts. The PDF format has historically been subject to a number of exploits this change means that PDF files will be downloaded and have to be opened in a dedicated PDF previewing app instead. Safari is the only modern browser to support the JPEG 2000 image format, which makes its support an easy way to identify Safari users. WASM was created to allow for high-performance applications on web pages however, it can be used to fingerprint browsers to track people across websites and apps. WebAssembly (WASM) support is also disabled.An analysis conducted by Mozilla indicates that over half of Chrome exploits "in the wild" abused a JIT bug, so disabling JIT can roughly cut your attack surface in half. Unfortunately, the added performance and complexity of JIT in JavaScript comes with a significant security cost. Disabling JIT shows performance decreases by up to 95% in some browser benchmarks, though this difference is difficult to notice in everyday browsing. JIT allows JavaScript code to be compiled on the fly during its execution. ![]()
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