Examine source code of Falling Boxes by MaDonna

{
  "name": "Falling Boxes by MaDonna",
  "manifest_version": 2,
  "version": "4.0",
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "rgba(0, 0, 0, 1)",
      "tab_background_text": "rgba(255, 194, 255, 1)",
      "toolbar": "rgba(0, 0, 0, 0)",
      "bookmark_text": "rgba(255, 194, 255, 1)",
      "toolbar_field": "rgba(0, 0, 0, 0.05)",
      "toolbar_field_text": "rgba(255, 255, 255, 1)",
      "tab_line": "rgba(22, 247, 45, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{2d6102e4-2eb2-4bb6-9e56-454269f3614f}"
    }
  }
}