Improvements for macOS Catalina
macOS Catalina introduced endless permission dialogs similar to the following:
Furthermore, when you ask fman to move a file to the Trash, Catalina shows:
The problem was, if you accidentally said no to these dialogs, then it was hard to get them back. This lead to fman not displaying some folder contents, or to files magically "re-appearing" after you deleted them.
To fix this, fman now opens a new documentation page when you are on macOS Catalina or later on first start. Other operating systems are not affected.
(A nicer way to fix this would have been for fman to check "do I have this permission?". Alas, macOS does not give us developers an API for doing that.)