Examine source code of Blue.Squid

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Blue.Squid",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg",
        "images/1.jpg",
        "images/2.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center center",
        "left center",
        "left bottom"
      ],
      "additional_backgrounds_tiling": [
        "repeat",
        "repeat-x",
        "repeat-x"
      ]
    },
    "colors": {
      "toolbar": "rgba(137, 137, 137, 0.83)",
      "toolbar_text": "rgb(60, 60, 60)",
      "frame": "rgb(0, 0, 0)",
      "tab_background_text": "rgb(196, 196, 196)",
      "toolbar_field": "rgba(52, 185, 223, 0.25)",
      "toolbar_field_text": "rgba(0, 0, 0, 0.75)",
      "tab_line": "rgba(52, 185, 223, 0.67)",
      "popup": "rgba(137, 137, 137, 0.72)",
      "popup_text": "rgb(15, 15, 15)",
      "button_background_active": "rgba(0, 0, 0, 0.69)",
      "icons": "rgba(0, 0, 0, 0.41)",
      "popup_highlight": "rgb(148, 146, 146)",
      "tab_background_separator": "rgb(14, 14, 14)",
      "tab_text": "rgba(0, 255, 255, 0.48)",
      "tab_loading": "rgba(52, 185, 223, 0.67)"
    }
  }
}