On the same day I first heard about a very specific product and searched for it using DuckDuckGo through Firefox with the Facebook Container installed and running, I saw an ad on Facebook for that exact product model. I had not been searching for other related products prior to this search, so it is not possible that Facebook inferred my interest in this product and this was simply a creepy coincidence. The only plausible possibilities are 1) Facebook Container failed to isolate my search from Facebook's tracking, or 2) Facebook truly does listen to conversations using laptop/smartphone microphones and uses this for targeted ads.