Examine source code of Edison Lights

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Edison Lights",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right center"
      ],
      "additional_backgrounds_tiling": [
        "repeat-x"
      ]
    },
    "colors": {
      "toolbar": "rgba(0, 0, 0, 0.63)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(36, 12, 55)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(255, 255, 255)",
      "toolbar_field_text": "rgb(0, 0, 0)",
      "tab_line": "rgb(244, 157, 0)",
      "popup": "rgb(255, 164, 0)",
      "popup_text": "rgb(0, 0, 0)",
      "button_background_active": "rgb(255, 145, 0)",
      "button_background_hover": "rgb(174, 113, 0)",
      "icons_attention": "rgb(255, 165, 0)",
      "icons": "rgb(255, 145, 0)",
      "ntp_background": "rgb(255, 165, 0)",
      "ntp_text": "rgb(0, 0, 0)",
      "sidebar_text": "rgb(0, 0, 0)",
      "tab_background_separator": "rgb(174, 113, 0)",
      "tab_text": "rgb(255, 255, 255)",
      "toolbar_field_highlight": "rgb(255, 165, 0)",
      "toolbar_field_separator": "rgb(255, 145, 0)",
      "toolbar_top_separator": "rgb(255, 145, 0)",
      "toolbar_vertical_separator": "rgb(255, 145, 0)",
      "tab_loading": "rgb(244, 157, 0)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{a52508e0-d619-4039-bcf3-6c59b0640faf}"
    }
  }
}