MetaLab recently blogged that Mozilla had used their design work without permission or attribution.  

At issue are early mockups for one of the Jetpack developer tools that included design elements from the MetaLab web site. While the design direction being implemented does not utilize these design elements, we inadvertently included the early mockups in our blog post and video announcing the next phase of development for the Jetpack SDK.

We’ve since removed all of the early mockups from our web sites, and updated the videos and screenshots with the correct content.

We sincerely apologize to MetaLab for incorporating design elements from their web site in our early mockups and for posting them publicly without proper attribution.

We’re actively investigating how this happened to ensure that it does not happen again.