Is this created by a third party based on own design ideas, or is this by a third party, based on ffOS design guidelines (do they exist already?) or is this pub

Is this created by a third party based on own design ideas, or is this by a third party, based on ffOS design guidelines (do they exist already?) or is this published by mozilla? It looks really great, but those were some questions that came up in my mind when I saw it. It never hurts to have a bit of description on the page. *edit : After doing some research, it seems to be a showcase of the Gaia Design Building Blocks page which can be found here: https://wiki.mozilla.org/Gaia/Design/BuildingBlocks https://wiki.mozilla.org/Gaia/Design/BuildingBlocks