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Hello. Is there a way for a fellow gmail user to tell if another recipient who also uses gmail ,if a message they have sent has been opened,and/or forwarded to another gmail user? Thankyou.
Modified by cs999
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This does not sound like an issue with Firefox but is something that the Gmail support team should be able to help you with.
A lot of email senders (mostly bulk email senders) use "beacon" images to detect that a message was viewed. This is why you can usually choose not to load images in a message until you first confirm that you want to do that.
More info: https://en.wikipedia.org/wiki/Web_beacon