Examine source code of Contributopia - Swarming

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#75b752",
      "tab_background_text": "#000"
    }
  },
  "version": "2.0",
  "name": "Contributopia - Swarming",
  "manifest_version": 2,
  "description": "Contributopia is a Framasoft's project to widespread opensource and learn people how to use Internet without GAFAM tools.\nBased on David Revoy's artwork - CC-BY"
}