During this GSOC, I worked on redesigning the about:telemetry page of Firefox. about:telemetry allows the users to inspect what anonymous usage data Firefox collects and sends to Mozilla's servers. My main goals were to reimplement this page to be more usable, more accessible, and more maintainable. Also the new design should be coherent with the new Firefox Photon redesign.
You can find all the bugs I have worked on this summer here. Mainly I modified the files toolkit/content/aboutTelemetry.*. If you feel interested in trying some of my changes just download Firefox Nightly (some commits are already available in Firefox Beta) or you can [build Firefox from source](https://developer.mozilla.org/en-US/docs/Mozilla/Developer_guide/Build_Instruc