Examine source code of FF Twilight GX

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "FF Twilight GX",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(28, 27, 34)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(0, 0, 0)",
      "tab_background_text": "rgb(206, 206, 206)",
      "toolbar_field": "rgb(28, 27, 34)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(248, 25, 94)",
      "popup": "rgb(26, 2, 9)",
      "popup_text": "rgb(255, 255, 255)",
      "frame_inactive": "rgb(234, 17, 84)",
      "icons_attention": "rgb(248, 25, 94)",
      "ntp_background": "rgb(28, 27, 34)",
      "popup_border": "rgb(248, 25, 94)",
      "tab_loading": "rgb(248, 25, 94)",
      "tab_selected": "rgb(26, 2, 9)",
      "toolbar_bottom_separator": "rgb(0, 0, 0)",
      "toolbar_field_border_focus": "rgba(0, 0, 0, 0)",
      "toolbar_field_focus": "rgb(28, 27, 34)",
      "toolbar_field_highlight": "rgb(170, 13, 59)",
      "toolbar_top_separator": "rgb(248, 25, 94)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{47a94414-7985-4d52-a19a-069dddb9a792}"
    }
  }
}