Firefox: We were fans of MailTrack when it was a Chrome extension because it's one of the simplest ways to get read receipts for emails you send on Gmail. Now, it's available for Firefox too. MailTrack is pretty straightforward: Add the extension, and you can track when an email you send is opened up by the recipient. You can also see how many times it's opened and where it was opened from. There's a premium subscription here too, which gets rid of the "Sent from Mailtrack" signature and adds in stuff like unlimited tracking, reminders and daily reports. Read receipts are always a bit controversial, but that doesn't mean they're not useful for some purposes.
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