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Re:​Mozilla quietly deploys built-in Firebox advertising by zb3 on Friday September 11, 2015 @10:23AM (#10203806)
As for fetching them, that's just a matter of blocking "tiles.services.mozilla.com".

However, I couldn't really understand what data is being sent to Mozilla in general use cases.

Does FF send data about normal browsing usage or just data about interaction with those suggested tiles?

Re:​Mozilla quietly deploys built-in Firebox advertising by vorian on Friday September 11, 2015 @10:44AM (#10203928)
From the article

'That said, Firefox does send your browser history to Mozilla. '

Re:​Mozilla quietly deploys built-in Firebox advertising by bzbarsky on Saturday September 12, 2015 @12:28AM (#10207218)
The article doesn't seem to contain this text anymore. Which is good, since it was false.