Trocker (Tracker Blocker) for Chrome and Firefox helps to block tracking in emails.
Everything that you do in an email message has the potential to be tracked; opening the email, clicking a link, etc. This data can be worth its weight in gold to advertisers, but bad-actors can also utilize the data for nefarious purposes.
Trocker is designed to block email trackers' attempts and won't let them track what you do with the emails you receive. It can be staggering to see how many of the emails include trackers. It keeps you safe in all webmails, including Gmail, Yahoo!, and Outlook.com. It has additional capabilities in Gmail, Inbox, and Outlook.com. Within these 3 webmails, it employs a heuristic tracker detection that will detect and block most email tracking attempts, even from new or obscure trackers.
Trocker is an easy-to-use option to determine if any email trackers are present, allowing you to keep what you do with the email in question private.