Examine source code of Happy

{
  "name": "Happy",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "Happy.jpg"
    },
    "colors": {
      "frame": "rgba(229, 230, 232, 1)",
      "tab_background_text": "rgba(245, 216, 112, 1)",
      "toolbar": "rgba(0, 0, 0, 0)",
      "toolbar_field": "rgba(0, 0, 0, 0)",
      "toolbar_field_text": "rgba(110, 205, 245, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{99043e2f-5527-424c-833a-67f2974474bf}"
    }
  }
}