Examine source code of purple-main

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "purple-main",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(99, 57, 119, 0)",
      "toolbar_text": "rgb(249, 150, 170)",
      "frame": "rgb(142, 179, 201)",
      "tab_background_text": "rgb(176, 217, 240)",
      "toolbar_field": "rgba(169, 180, 251, 0.4)",
      "toolbar_field_text": "rgb(191, 194, 241)",
      "tab_line": "rgb(248, 112, 140)",
      "popup": "rgba(252, 228, 229, 0.99)",
      "popup_text": "rgb(100, 73, 157)",
      "button_background_active": "rgb(95, 23, 125)",
      "button_background_hover": "rgb(142, 45, 183)",
      "ntp_background": "rgb(99, 57, 119)",
      "ntp_text": "rgb(255, 112, 126)",
      "tab_loading": "rgb(248, 112, 140)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{60b3d282-26ad-45c0-97d8-43934c9d7e72}"
    }
  }
}