Started seeing calls to https://clients1.google.com/tbproxy/af/query?q=Chc2LjEuMTcxNS4xNDQyL2VuIChHR0xMKRMZBFFnkIYJep0jLXsS_EEkFBMZlgLZ2z-PDq8jLZFhlU4kFA== in wpt waterfall. Seems like this has been an issue in the past. Attempted to reply on those threads but I get a 500 error.