Mozilla Facebook Container - Take control of all your Facebook data
PixelBlock - Block email open tracking inside of Gmail
Ghostery - Privacy tool for transparency and control
Ugly Email for FireFox - Get back your email privacy, block email tracking
Facebook Clear History - Delete data that Facebook has collected on you
Email Privacy Protector - Check the presence of email ids on your webpages using Email Privacy Checker tool and protect yourself from email spammers.