Safari OS X: Fix Facebook web login buttons not working anymore

Here's a fix for Safari 8 on OS X Yosemite on how-to resolve the issues with the Facebook Single-Sign-On Login Buttons on websites not working anymore, due to a strict Cookie & website data restriction setting in Safari's Preferences.

Can't close image by clicking the X or pressing Esc on Facebook. Must close browser window/tab. : r/facebook

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