The bottom of the page says it was updated today, now it says this:
> Are these stories personalized to me?
> For the most part, no. Most recommendations on your new tab come from a general list of the best of stories on the web. But Pocket is actively exploring ways to deliver personalized recommendations in a way that vigorously protects users’ privacy. Importantly, neither Mozilla nor Pocket ever receives a copy of your browser history. When personalization does occur, recommendations rely on a process of story sorting and filtering that happens locally in your personal copy of Firefox.
> Are these stories personalized to me?
> For the most part, no. Most recommendations on your new tab come from a general list of the best of stories on the web. But Pocket is actively exploring ways to deliver personalized recommendations in a way that vigorously protects users’ privacy. Importantly, neither Mozilla nor Pocket ever receives a copy of your browser history. When personalization does occur, recommendations rely on a process of story sorting and filtering that happens locally in your personal copy of Firefox.