Does not work on more than one email. If you have more than one Gmail account open in the same browser (different tab) it works only in one email and keeps you going in a loop to login - re-login into account to upgrade to buy. I have only one app from CloudHQ - Free Email Tracking Blocker installed - but the dashboard says, I have two apps, the other: Sync and Backup - this is not true. Uninstalling. Disappointed.
The plugin is a security tool that blocks senders from knowing when you open/read their emails, protecting against pushy salespeople and email tracking attempts
It provides email privacy protection and security