Examine source code of Astolfo<3

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Astolfo<3",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg",
        "images/1.jpg",
        "images/2.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center center",
        "left top",
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "no-repeat",
        "no-repeat",
        "no-repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(255, 64, 112, 0.44)",
      "toolbar_text": "rgb(0, 0, 0)",
      "frame": "rgb(255, 255, 255)",
      "tab_background_text": "rgb(0, 0, 0)",
      "toolbar_field": "rgba(255, 255, 255, 0.57)",
      "toolbar_field_text": "rgb(0, 0, 0)",
      "tab_line": "rgb(0, 0, 0)",
      "popup": "rgb(255, 255, 255)",
      "popup_text": "rgb(0, 0, 0)",
      "button_background_active": "rgba(255, 255, 255, 0.73)",
      "button_background_hover": "rgba(255, 255, 255, 0.48)",
      "ntp_background": "rgba(255, 64, 112, 0.24)",
      "ntp_text": "rgb(255, 64, 112)",
      "popup_border": "rgba(255, 64, 112, 0.44)",
      "popup_highlight_text": "rgba(0, 0, 0, 0.44)",
      "popup_highlight": "rgba(255, 64, 112, 0.24)",
      "sidebar_border": "rgba(255, 64, 112, 0.44)",
      "sidebar_highlight_text": "rgb(0, 0, 0)",
      "sidebar_highlight": "rgba(255, 64, 112, 0.24)",
      "toolbar_bottom_separator": "rgba(255, 64, 112, 0.44)",
      "toolbar_field_border": "rgba(255, 64, 112, 0.44)",
      "toolbar_field_highlight_text": "rgb(0, 0, 0)",
      "toolbar_field_highlight": "rgba(255, 64, 112, 0.44)",
      "toolbar_top_separator": "rgba(255, 64, 112, 0.44)",
      "tab_loading": "rgb(0, 0, 0)"
    }
  }
}