Examine source code of Nightly Fox Light

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Nightly Fox Light",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right center"
      ],
      "additional_backgrounds_tiling": [
        "no-repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(243, 244, 247, 0)",
      "toolbar_text": "rgb(0, 0, 0)",
      "frame": "rgb(255, 255, 255)",
      "tab_background_text": "rgb(0, 0, 0)",
      "toolbar_field": "rgba(255, 255, 255, 0)",
      "toolbar_field_text": "rgb(55, 0, 155)",
      "tab_line": "rgb(25, 0, 158)",
      "popup": "rgb(255, 255, 255)",
      "popup_text": "rgb(0, 0, 0)",
      "button_background_active": "rgba(55, 0, 155, 0.5)",
      "icons_attention": "rgb(0, 230, 250)",
      "icons": "rgb(0, 0, 0)",
      "ntp_background": "rgb(255, 255, 255)",
      "ntp_text": "rgb(0, 0, 0)",
      "popup_highlight_text": "rgb(0, 0, 0)",
      "popup_highlight": "rgb(0, 230, 250)",
      "sidebar_highlight_text": "rgb(0, 0, 0)",
      "sidebar_highlight": "rgb(0, 230, 250)",
      "sidebar_text": "rgb(0, 0, 0)",
      "tab_background_separator": "rgba(0, 0, 0, 0)",
      "tab_loading": "rgb(255, 255, 255)",
      "tab_selected": "rgb(55, 0, 155)",
      "tab_text": "rgb(255, 255, 255)",
      "toolbar_field_border": "rgb(55, 0, 155)",
      "toolbar_field_focus": "rgb(255, 255, 255)",
      "toolbar_field_highlight_text": "rgb(0, 0, 0)",
      "toolbar_field_highlight": "rgb(0, 230, 250)",
      "toolbar_field_text_focus": "rgb(0, 0, 0)",
      "toolbar_top_separator": "rgba(0, 0, 0, 0)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{1a69f41f-9af6-4586-bacf-16b343de9065}"
    }
  }
}