Examine source code of Blueberry Gum

{
  "manifest_version": 2,
  "version": "1.2",
  "name": "Blueberry Gum",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png",
        "images/1.png",
        "images/2.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center center",
        "center center",
        "center center"
      ],
      "additional_backgrounds_tiling": [
        "no-repeat",
        "no-repeat",
        "no-repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(195, 216, 229, 0.15)",
      "toolbar_text": "rgb(116, 26, 45)",
      "frame": "rgb(132, 188, 237)",
      "tab_background_text": "rgb(32, 35, 102)",
      "toolbar_field": "rgba(255, 244, 222, 0.8)",
      "toolbar_field_text": "rgb(123, 127, 204)",
      "tab_line": "rgb(176, 51, 79)",
      "popup": "rgb(255, 244, 222)",
      "popup_text": "rgb(98, 102, 183)",
      "tab_loading": "rgb(176, 51, 79)"
    }
  }
}