MAMP users might get prompted for FTP credentials when trying to add a new WordPress plugin.

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One solution is to set MAMP as the owner (www) in Hosts > Permissions but this method will require you to go back and forth frequently. The other solution is to Run Apache/MySQL server as user/user.

In MAMP, go to Server > General > Run Apache/MySQL server as user and select your username.Screen Shot 2013-09-05 at 7.32.49 PM