In April 2013, following feedback from others, the site was switched over to using a different default colour scheme (with the old one still supported via a toggle on the pages)

A number of other important improvements were made too, including reducing the site's use of cookies, improving transparency (via the launch of mod_yourData) and the addition of some basic privacy options to the left-hand side of the site.

In the ensuing time, those privacy options have changed/improved and new privacy features have been added - including multihoming the site so that it's accessible as a Tor .onion, and enabling opportunistic encryption. Others, like support for the dark theme have been removed (though the theme seemingly still works, as that's how I got the screenshot for the V3 information page