System extensions are a category of software that works in the background to extend the functionality of your Mac. 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. Your Mac identifies these as legacy system extensions.

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In 2019, Apple informed developers that macOS Catalina will be the last macOS to fully support legacy system extensions, and we've been working with developers to transition their software. By moving beyond these extensions, developers are helping to further modernise the Mac, improve its security and reliability, and enable more user-friendly software distribution methods. A final transition date has not been set yet.

Until the transition is complete, your Mac displays a message when a legacy system extension first loads, and again periodically while the extension remains in use. This gives you advance notice that existing software on your system loaded a system extension that will be incompatible with a future version of macOS:

Legacy system extensions and the apps that rely on them continue to work today. But now is a good time to contact the developer to learn whether an updated version of their software is available or planned. The developer can also explain how to remove or disable the extension, and the consequences of doing so.

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Technical details for developers are available in Deprecated Kernel Extensions and System Extension Alternatives.

Use extensions to place the power of your app wherever your users need it most. Types of app extensions iOS, iPadOS, macOS, tvOS, and watchOS support several types of extensions, each of which is tied to a single, well-scoped area of the system, such as sharing, Notification Center, and Safari. Colibri is not a free app but a paid music player Mac users definitely enjoy. It boasts a high-resolution, lossless playback experience with formats like FLAC, ALAC, WAV, AIFF, DSD, TTA, and more. One of the notable points about this player is it’s incredibly tiny CPU and battery usage, which a lot of users appreciate.

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May 22, 2020 Delete the app preference file. Plist files can become corrupt when a Mac shuts down or restarts unexpectedly or when an app freezes or crashes. As a result, the app may not open. When you delete a bad preference file, the Mac creates a new plist file that contains all the app's defaults automatically.

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Small programs that add new features to your browser and personalize your browsing experience. GarageBand is a fully equipped music creation studio right inside your Mac — with a complete sound library that includes instruments, presets for guitar and voice, and an incredible selection of session drummers and percussionists.