How did sextracker get downloaded on my computer?

How did sextracker get downloaded on my computer?

s3xtracker is a cookie and you most likely got it on your computer from visiting a p0rnographic web page- if not you someone on your computer.

I do not believe that it is a program, but it is simply a cookie. you can set your browser to a more secure criteria, and accept cookies outright, but if I were you I would just delete the history after each session to avoid other family members finding out you are a p0rn hound.