October 2013 until October 2014
Pantheon is a series of connected sponsored efforts to improve the security and usability of Torbrowser.
Artemis is work to use Persona/BrowserID issue rate-limited or valuabe opaque tokens so that sites can deal with Tor users more easily.
Chronos is our work to build a secure automatic updater.
Demeter is improvements to the Firefox guts inside Trobrowser, and development of additional APIs.
Erebos is improvements to the integration of pluggable transports and bridges.
Hephaestus is improvements to our deterministic build process and infrastructure.
Metis is the implementation of several UX improvements to Torbrowser's bundled add-ons, and other add-on work.
Prometheus covers the process and work of merging relevant improvements back upstream into Firefox.