@dsvdv Thanks for sharing. To the best of my (limited) knowledge, the safebrowsing and fonts Google subdomains are pretty standard (I believe the former is used by most browsers for checking security of sites etc., though I could be wrong). As for the Google Firebase Analytics, of course this is concerning (anything Google "analytics" for that matter!). I expect I'll do some research around this. It may be because Preview is still in dev/testing stages.