Adapt the design of the Tor Launcher, Torbutton, ...etc and even the about:tor page to the new Firefox Photon UX

Photon UX guidelines are available here http://design.firefox.com/photon/ e.g.

• colors: http://design.firefox.com/photon/visual/color.html
• fonts: http://design.firefox.com/photon/visual/typography.html

...etc