01/18/2020
I did an extensive analysis of https://www.startpage.com using the UBlock Origin, UMatrix, Disconnect, Privacy Badger, Cookie Autodelete and HTTPS Everywhere Firefox addons. Result: I found that cookies, images, css, media, scripts ... everything, came from one domain only: startpage.com. Not a single script for any other domain (including Google), no tracking cookies, no analytics, no ad related JavaScript, no CDNs, no tags, beacons ... NOTHING, only startpage.com.
I did my "homework" and now I can believe on what I see, startpage is currently CLEAN as it always was.