"We believe that the discovery and accessibility of high quality web content is key to keeping the internet healthy by fighting against the rising tide of centralization and walled gardens" that alone is a reason to welcome this aquisition. Facebook has become for many, me included the entry point to the web much more so than the browser and I really don't like that. I can imagine Mozilla suggest content to users based in what they have saved in the past on pocket and integration with Firefox. Nice move.