Examine source code of Chroma burst

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Chroma burst",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png",
        "images/1.png",
        "images/2.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "left top",
        "right top",
        "center top"
      ],
      "additional_backgrounds_tiling": [
        "repeat-y",
        "repeat-y",
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(123, 62, 226, 0.2)",
      "toolbar_text": "rgb(220, 235, 246)",
      "frame": "rgb(142, 179, 201)",
      "tab_background_text": "rgb(211, 223, 241)",
      "toolbar_field": "rgba(255, 255, 255, 0.6)",
      "toolbar_field_text": "rgb(58, 58, 58)",
      "tab_line": "rgba(169, 126, 242, 0.8)",
      "popup": "rgba(170, 66, 231, 0.3)",
      "popup_text": "rgb(227, 227, 227)",
      "tab_loading": "rgba(169, 126, 242, 0.8)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{8c36e122-c2fc-4dcc-868e-54415d98be7a}"
    }
  }
}