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by lolinder 897 days ago
There was this, a couple months ago:

Firefox displayed a pop-up ad for Mozilla VPN over an unrelated page (382 comments) https://news.ycombinator.com/item?id=36077360

I tabbed away from Firefox for a bit, and when I tabbed back I had a full screen popup ad for Mozilla VPN overlayed on top of the webpage I had been using.