And Apple isn’t going to let it happen much longer for security purposes.Īpple began telling app developers that it planned to deprecate system extensions in 2019 and it’s now up to them to use other methods. Or to put it another way, an app you are using has its tentacles in the underpinnings of how macOS works via a kernel extension. Your Mac identifies these as legacy system extensions. Some apps install kernel extensions, which are a kind of system extension that work using older methods that aren’t as secure or reliable as modern alternatives. System extensions are a category of software that works in the background to extend the functionality of your Mac. Apple makes a better job of explaining things in a knowledge base article, describing system extensions as follows: Legacy system extensions are basically kernel extensions which will no longer work soon on the Mac. What Are Legacy System Extensions on Mac? So, what exactly does this message mean? Not a lot right now, but come the arrival of macOS Monterey 12, macOS Big Sur 11, / 10.16, and from the end of 2020 onward – it’s going to mean a lot. Titled “Legacy System Extension”, the message goes on to note that “ existing software on your system loaded a legacy system extension by (developer) which will be incompatible with a future version of macOS” and while that might not mean much to most people, it is something you should take note of.
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