At the risk of being downvoted, here's a "conspiracy theory." Why did the ad block for firefox recently stop working for youtube and google sponsored video ads? Personally, firefox's superior ad block was the last thing preventing me from defaulting chrome. Maybe google engineers figured out a way around the ad block, who knows. Regardless, does anyone know an ad block that still takes care of the video ads?
I had this happen to me several weeks ago, it turned out the blocking list I had subscribed to (EasyList) got switched with the new default "Fanboy's List". I had switched back and haven't been plagued by video ads since.