> In CY 2018, Mozilla Corporation generated $435.702 million from royalties, subscriptions and advertising revenue compared to $542 million in CY 2017. 2017 was an outlier, due in part to changes in the search revenue deal that was negotiated that year. Despite the year-over-year change, Mozilla remains in a strong financial position with cash reserves to support continued innovation, partnerships and diversification of the Firefox product lines to fuel its organizational mission.
However, as noted earlier, the corp does pay for the foundation's advocacy:
> A portion of search revenue combined with grants and donations is used to fuel the advocacy and movement building work of the Mozilla Foundation and its broad network of supporters of Mozilla’s mission.