Read the last bits at the end of the article though:

Firefox does collect and share some data with its partners, Mozilla said, including data that helps to power its optional ads on the New Tab page in the browser and for sponsored suggestions in the search bar, which are detailed in its Privacy Notice. However, the company says that the user data it does share is stripped of personally identifying information and is only shared in aggregate.

Users can continue to adjust their own data-sharing settings in the browser, Mozilla also said.

Personally, this doesn’t compel me to stop using Firefox.