Yes, I am also using Firefox with uBlock Origin locked down - no 3rd-party scripts, 3rd-party no frames, etc... Local network also has a pi-hole. I should clarify that it was an overlay style popup - not an actual browser window popup.
I also didn't get a popup. I then tried after disabling Ublock and Privacy Badger in a private browsing window to ensure that no cookies affected the result. After doing this, I still did not get any popup.
