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It’s probably an extension or app either in your browser or, if you have one, your Android phone/tablet. If you have been monitoring your account activity and this is the first time you have seen it, I would check the permissions of any apps or extensions that you have recently installed. I’m not certain, but there was a recent update to the Google Keyboard for Android devices that looks at your Google activity to refine text prediction. There is a chance that is what you are seeing.