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.

Fix Mac Notifications Not Showing/Working on Ventura/Monterey

How to Allow & Block Pop-Ups in Safari, Mac & iPhone

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How to Install, Manage, and Delete Safari Extensions

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I am having trouble logging in with Google on Safari

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