Some of these look fairly useful. I can attest to Facebook Photo Zoom. I consider Photo Zoom to be an indispensable feature of my personalized Facebook experience. I do not use any of the others, although I may try Social Fixer and Facebook Unseen. The latter blocks the sending of read receipts when someone sends you a Facebook message. After all, you’re not always in the mood to reply to a Facebook message, but don’t want to be rude.