PixelBlock - Block email open tracking inside of Gmail
Ugly Email for FireFox - Get back your email privacy, block email tracking
MailTrackerBlocker - Developer solving interesting problems with APIs. OSS contributor (Slim Framework, rst2pdf, OpenWhisk) & amateur photographer. He/him.
Mailintel - Analytics and reporting dashboard for transactional emails.
Big Tech Detective - a browser extension to help you track tech giants
Extension Police - Police your chrome extensions