It’s funny when you think of it, now both browsers want to shove ads down my throat. I hate the modern internet.
It's also worth pointing out that the included ads are targeted locally on your computer, and none of your browsing data gets sent to Mozilla (https://help.getpocket.com/article/1142-firefox-new-tab-reco...).
And it's also really easy to turn them off (preferences > home > "sponsored stories").
I have my Firefox homepage set to a blank page and see nothing of the sort.
Because of your comment, I temporarily set my homepage back to "Firefox Home," but didn't see any ads. Just a a few recommended news articles.
Yes, google never shows you ads.