Examine source code of NeonLight Rainbow

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Neon Rainbow",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(0, 0, 0, 0.1)",
      "toolbar_text": "rgba(255, 255, 255, 0.9)",
      "frame": "rgb(9, 11, 29)",
      "tab_background_text": "rgb(176, 176, 176)",
      "toolbar_field": "rgba(24, 18, 44, 0.26)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgba(255, 255, 255, 0.7)",
      "popup": "rgb(32, 25, 59)",
      "popup_text": "rgb(255, 255, 255)",
      "button_background_hover": "rgba(130, 130, 130, 0.5)",
      "tab_loading": "rgb(0, 255, 41)",
      "toolbar_bottom_separator": "rgba(255, 255, 255, 0.2)",
      "toolbar_top_separator": "rgba(255, 255, 255, 0.2)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{3bcfbec6-2e91-4a5d-9d85-13d0a1b58158}"
    }
  }
}