Please note that Linux distributors may provide packages for your distribution which have different requirements.
Exporting from with Desktop Safari 12 and 13 is a real chore as Apple is constantly striving for better privacy/security within its own ecosystem. Firefox Focus is not available for Mac but there are plenty of alternatives that runs on macOS with similar functionality.
Works with Chrome, Firefox, others as described in documentation online. Please note that while the 32-bit and 64-bit versions of Windows Vista and Windows 7 can be used to run Firefox 26, only 32-bit builds of Firefox 26 are supported at this time. Easily syncs between Mac/iOS/PC instances of Firefox.