I've seen various Chrome or Firefox extensions that allow tracking Gmail messages so that I can know when a recipient views (or clicks on links within) an email.
For example:
- Yesware
- getsidekick.com
- bananatag.com
- streak.com
- toutapp.com
- rocketbolt.com
But, as a software engineer who knows how extensions work and how they reveal my private email data to the maker of the extension (I've seen some really creepy stuff), I really don't want to have any of those installed.
If an open-source project exists (probably coded in javascript), I'd love to tweak it and use that rather than grant access to 3rd party tools.
Thanks!