Examine source code of Shapes - Yellow

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Shapes - Yellow V2",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-045-3e6898966e6ccdc87f80d23d4e7a6a49.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(223, 255, 246, 0.71)",
      "toolbar_text": "rgb(0, 0, 0)",
      "frame": "rgb(246, 248, 212)",
      "tab_background_text": "rgb(0, 190, 201)",
      "toolbar_field": "rgba(255, 255, 255, 0.46)",
      "toolbar_field_text": "rgb(31, 162, 211)",
      "tab_line": "rgb(0, 255, 200)",
      "popup": "rgb(243, 255, 250)",
      "popup_text": "rgb(0, 0, 0)",
      "button_background_active": "rgba(0, 175, 179, 0.36)",
      "ntp_background": "rgba(249, 255, 184, 0.39)",
      "ntp_text": "rgb(0, 0, 0)",
      "tab_loading": "rgb(0, 255, 200)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{012d81b8-6f63-4b26-8a48-d93f462f4e0b}"
    }
  }
}