The default Firefox 2 theme (designed/made by Radiant Core) updated for Firefox 55 and above.
This (complete) theme will stop working on November 14, 2017 because Complete Themes will stop working in Firefox 57. However, if and when the new Theming API is mature enough to continue developing the theme on/for, I'll be sure to try and make a WebExtension version of the theme.
For now: "So Long, and Thanks for All the Fish."
Latest stable version
Latest beta build/version
Firefox 2, the theme, reloaded is currently being developed and maintained by:
Please report bugs, issues and suggestions in the issue tracker (preferred) or write a comment on Fabio's [project page](http://www.varesano.net/contents/projects/firefox 2 theme firefox 3x?utm_source=GitHub).
