My first guess is that advertising won't support HTTPS therefore making a mixed session and the user having to deal with the browser "do you want to continue" dialogs

More information: Google Ads doesn't support HTTPS. What alternatives are there?

Perhaps SO had a different way of dealing with advertisements.

My first guess is that advertising won't support HTTPS therefore making a mixed session and the user having to deal with the browser "do you want to continue" dialogs

More information: Google Ads doesn't support HTTPS. What alternatives are there?

Perhaps SO had a different way of dealing with advertisements.