I usually do my work in Google Chrome (v36.0.1985.143), private browsing enabled. I use Firefox to browse Stack Exchange, in normal mode so that all my logins are persisted.

Sometimes I accidentally open an SE question in Chrome, so I copy-paste the URL to Firefox and get on reading. I left the SE tab in Chrome open, and up-voted a question in Firefox.

Normally, you immediately see other users' voting activity via socket event emitting (possibly Socket.IO, I don't know SE's back-end). I noticed that in my Chrome tab, I didn't see the upvote that I had cast in Firefox. I had to refresh to be able to see the vote count change.

So, as the title of the question states: does private browsing prevent socket events?