My latest contribution to the free software community is a web extension for Firefox and Chrome called GitHub Avatars.
It simply doubles the size of avatars in Issues. Additionally, it adds a name next to them (only on page load, so GitHub tries to reactively update the issues view; the names are missing).
The goal of this extension is to help you understand which issues are assigned to which user.
Source code and Firefox / Chrome links are available on the GitHub Avatars GitHub page.