If you’re still running Lion or Mountain Lion, making the ~/Library folder requires a little bit of work. Mavericks now offers a simple setting to make the ~/Library folder visible. You just need to know how to make the folder visible again.

Luckily, as I mentioned, the folder is merely hidden, using a special file attribute called the hidden flag. While I understand Apple’s motives here-I’ve had to troubleshoot more than a few Macs on which an inexperienced user has munged the contents of ~/Library-a user can have plenty of valid reasons for needing to access the personal Library folder.

This is the same reason Apple has always hidden the folders containing OS X’s Unix underpinnings: /bin, /sbin, /usr, and the like. The reason for this move is presumably that people unfamiliar with the inner workings of OS X often open ~/Library and start rooting around, moving and deleting files, only to later discover that programs don’t work right, application settings are gone, or-worse-data is missing.

Will finder mac open library files