macOS
Virtual machines in Parallels Desktop may open in native macOS tabs, I personally don't like this as it shifts the desktop resolution when the tab bar appears. This behavior can be disabled with this Terminal command: defaults write com.parallels.desktop.console AppleWindowTabbingMode manual
macOS
macOS Sequoia 15.0 seems to have random network connectivity issues causing various apps to randomly disconnect. Some people advise disabling network extensions (the only one I had is Little Snitch), completely turning off the system firewall (System Settings > Network > Firewall) fixes the issue on my 2019 Intel
macOS
For some bizarre reason, downloading certain Steam games on macOS to an external disk can hang UVFSService with 100% CPU and cause system instability when any app tries to interact with the same external disk. When the hang happens, the only way to fix the issue is to kill UVFSService
macOS
Host machine is macOS 11.4 and the latest and tested software versions as of the time of writing: * Parallels Desktop version 16.5.0 (49183) * VMware Fusion version 12.1.2 (17964953) Parallels and VMware don't know how to handle the new Install macOS 12 Beta.app,
macOS
Safari 14 now supports WebExtensions, in addition to Safari App Extensions and after killing off Legacy Safari Extensions (.safariextz) The official guides provided by Apple (a bit buried): https://developer.apple.com/documentation/safariservices/safari_web_extensions A couple of notes: * Safari's WebExtensions implementation isn't feature-parity
macOS
The developer beta of macOS Big Sur is now available for download and experimentation. Installing Mac betas inside a virtual machine doesn't provide the full experience, but it's still useful to get a first look and try out app compatibility. Host machine is macOS 10.15.
macOS
Note: This is no longer applicable starting from macOS Big Sur as softwareupdate --ignore has been removed :( Starting from macOS Mojave, Apple moved the system update functionality from the App Store to the Settings app, but they ‘forgot’ to implement the Hide Update function that existed on the previous version.