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So the beacon tracks a user by their IP address and browser client information. Advertisers/marketers have you put a 1px x 1px transparent GIF or PNG image on

So the beacon tracks a user by their IP address and browser client information. Advertisers/marketers have you put a 1px x 1px transparent GIF or PNG image on your pages or in an email blast. The image is hosted on their remote server. Then the remote server put your information into a database. By cross-referencing your IP browser agent information they can track you by without creating a cookie, local storage, or indexed database anymore. At least the Mozilla foundation is trying to to create an Opt-Out standard. But who says any of them will adopt this standard.

p0peax 9y ago
This is a reason to be wary of loading external images by default in mail. I don't know if they do, but spammers could quickly identify active e-mail addresses using this technique, so simply opening a mail could mean you would get even more spam, because your e-mail address is now marked as active.