Examine source code of Ruru-Chan

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Ruru-Chan",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(148, 157, 173, 0.49)",
      "toolbar_text": "rgb(203, 255, 211)",
      "frame": "rgb(255, 206, 220)",
      "tab_background_text": "rgb(0, 0, 0)",
      "toolbar_field": "rgba(0, 0, 0, 0.2)",
      "toolbar_field_text": "rgb(251, 131, 165)",
      "tab_line": "rgb(208, 254, 255)",
      "popup": "rgb(255, 255, 255)",
      "popup_text": "rgb(251, 131, 165)",
      "button_background_active": "rgb(148, 157, 173)",
      "ntp_background": "rgb(255, 202, 217)",
      "ntp_text": "rgb(28, 171, 176)",
      "tab_loading": "rgb(208, 254, 255)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{30237fec-c42f-4438-8f36-f05bc5499c61}"
    }
  }
}