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Note: This is no longer applicable starting from macOS Big Sur as softwareupdate --ignore has been removed :( Starting from macOS Mojave, Apple moved the system update functionality from the App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.