Mudita: Sympathetic or vicarious joy; delighting in other people's well-being.
This is a Firefox addon (currently very early, and pre-release) that surfaces the participation information that's tucked away in contribute.json files on various websites. It does this by adding an icon to the toolbar, detecting whether or not a site has a contribute.json file available and lighting up if it does.
This is a very early, prerelease version of this software. Help is always appreciated, and the code lives on GitHub.